Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b8673a51fd3d5d…

MALICIOUS

PDF

52.0 KB Created: 2020-09-30 01:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 811d5ff07d35d9ba93087d5f542556c3 SHA-1: 7304a734ff765dbd38b4867f3505c14512056f67 SHA-256: a6b8673a51fd3d5def5abfeaa3def93a24ea5be92735add79ccad1098912d785
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=adharam+madhuram+pdf+download In PDF document text
    • http://files.malleeonlinesolutions.com/uploads/1/3/0/9/130969254/vasawuzowevuru.pdfIn PDF document text
    • http://files.snydersbuildings.com/uploads/1/3/1/3/131380558/5f42a7.pdfIn PDF document text
    • http://files.proclaimerssanctuary.org/uploads/1/3/0/9/130969150/7061478.pdfIn PDF document text
    • http://wabozazu.hankandmurphy.com/uploads/1/3/1/4/131406082/loxebamubefudebat.pdfIn PDF document text
    • http://files.timpasteur.com/uploads/1/3/1/8/131857650/8ffb11.pdfIn PDF document text
    • http://vajak.aspectcareers.com/uploads/1/3/1/4/131453330/4231690.pdfIn PDF document text
    • http://dogife.hannahartiss.com/uploads/1/3/1/6/131606679/jesazarapat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/4131/7015/files/27595343249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1777/0920/files/ms_word_resume_template_simple.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9769/9992/files/snow_on_tha_bluff_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7509/3159/files/jagekani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4318/2999/files/81000465010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1755/0499/files/dr_br_ambedkar_biography_in_bengali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peposorutap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0282/9734/files/vivojavakewi.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 5184 bytes
SHA-256: 64776aefd68820821612c560532561b788786be4bbb52272d5e140e5d5f65302
font_01_sfnt_off00007377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7377 3772 bytes
SHA-256: b850e935aaf604f3e1824861b6c46746957ce6d0e1401f4bf16d070b42224529
font_02_sfnt_off00007f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1B 10112 bytes
SHA-256: 245817cc5dd48db1f1ed0d4e12e7454b299d0cad6380625af300eee2d4e23640
font_03_sfnt_off0000a1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F5 10056 bytes
SHA-256: 0f37c6f6c1e068cecf178fd70633650250d0a615dcd8378e5ee9913dad626b81