Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff96530db17a7480…

MALICIOUS

PDF

38.8 KB Created: 2020-07-25 00:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 4064268bd716c2f9e668b780634d59ac SHA-1: 2755c7ad46b497b304d4927e01cf3cc61d11b064 SHA-256: ff96530db17a7480324a53b74f211684d4374272d0f312587415f5e8ea4a1374
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary URL points to a redirector service, likely to obscure the final destination. The document body is heavily obfuscated and unreadable, but the presence of a link farm and a malicious redirector strongly suggests a phishing or SEO manipulation attack pattern.

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://ttraff.com/wb?keyword=radiocommunications%20act%201992%20pdf In PDF document text
    • http://files.rockingcleatherandboutique.com/uploads/1/3/1/3/131383510/7375545.pdfIn PDF document text
    • http://files.thetntmteam.com/uploads/1/3/1/3/131382395/9052969.pdfIn PDF document text
    • http://files.sthelenasportsday.com/uploads/1/3/1/4/131438353/visetu-bemixugokaxono-volojeselaku-bafawobowodiwuk.pdfIn PDF document text
    • http://files.dpjutzi.com/uploads/1/3/1/8/131859370/rozimopoxabipomo.pdfIn PDF document text
    • http://files.diguiseppe.com/uploads/1/3/2/6/132680926/09fe2664daa.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/1/0431/8937/1044/files/kufozujedukesebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/75708539825.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/99943125875.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2151/6448/files/72005717781.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/varukivotifajizug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/14030981430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/wimuxakudiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/banejugakasojimol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/nuparuxegigulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2883/2675/files/dikoxetudeput.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/jivukixaperosavubenilere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54903558396.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/zosunegexesewupukuduzod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/lapenilasabomoxu.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_off00005a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3B 5284 bytes
SHA-256: 335ed3fb68f6e7de209b86d787be5434f36934d17a88fd3b32df917d6115a4a6
font_01_sfnt_off00006c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1E 9992 bytes
SHA-256: 4cea9f713ee1a63b8ff6dd4d4706a3de3be2e8298c663a376b0241bada7915f5