Malicious PDF — malware analysis report

Static analysis result for SHA-256 938b44f911e7b83c…

MALICIOUS

PDF

48.0 KB Created: 2020-10-29 06:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 942c8cd329080298589f974b2767f106 SHA-1: 8582029a7ebc3050d5c609afefa23583cbf513bf SHA-256: 938b44f911e7b83c75f6c533d7fb031e0180b5fc4c743b8b181f03757aa42b3c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. The primary redirector URL, https://ggtraff.ru/aws?keyword=afk+arena+codes+wiki, is flagged as malicious. The document body, though heavily obfuscated, contains the same lure text and URL, indicating an attempt to trick users into visiting a malicious site. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/aws?keyword=afk+arena+codes+wiki In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f8fab79640ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_5f92afb1e407e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f9193423e9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5f92059f66192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f8fb90c8412f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f92407fd7cad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5f8b5c40a56fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7347/7052/files/33652417740.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/liposovi.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/similarity_transformation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2688/8862/files/scar_tissue_anthony_kiedis_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/1556640225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7920/2469/files/add_button_click_event_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/ray_bradbury_skeleton.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/zogawibijezosiroxinokuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/tademafotigum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/4.1_studying_atoms_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/pumenigunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0884/1657/files/betty_eadie_embraced_by_the_light.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/black_magic_symptoms_in_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/zupuwibuxatomama.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/basic_antenatal_care.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3874/8071/files/mmrda.maharashtra.gov.in_recruitment_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9664/4016/files/giant_tcr_advanced_2020_size_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5E 5128 bytes
SHA-256: 10f0651074bc9e5763268570f57de9da0967c2e4a16facfccb93719b56a6c2a4
font_01_sfnt_off00008ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF8 10472 bytes
SHA-256: 379690f0abec9d52b80a478c556c6fb8e32ada5a72a14f6a8f87c876cbea7643