Malicious PDF — malware analysis report

Static analysis result for SHA-256 379706fa8daf2b6b…

MALICIOUS

PDF

42.0 KB Created: 2020-11-03 10:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4a10e77f4bedaddf899718a3b465f0c2 SHA-1: 2b4c44b0267a4e6608ec45adb5f3cb86dfa5551b SHA-256: 379706fa8daf2b6b2466fb3636b31ef68224d72ddbe682611b9ba3579e36e059
202 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm designed for SEO manipulation, likely to trick users into downloading malware. The ML classifier strongly supports this assessment. The embedded URL 'https://gettraff.ru/aws?keyword=btd+5+apk+pc' is a known malicious redirector, and the document body contains a similar URL, suggesting a phishing or malware distribution lure.

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/aws?keyword=btd+5+apk+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f95f976347f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce0bf53-809d-4c2e-bddf-1ff4dcb0d729/mutisube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90365ed-2b1b-4cca-b150-33578ec9005a/33752078074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7169/3500/files/thanksgiving_vocabulary_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67f51e1-4d4c-49bd-818a-7e1aaa91ba9b/13739531094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd758dc5-0925-4a2c-a08f-58ab328e21c0/sumalud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb09e606-5144-4b57-93a4-fb26afef81b2/it_2017_full_movie_download_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739fa840-900e-436f-a6ad-e765d65050d4/jukudaxebomaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8706/7819/files/tax_law_reviewer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d320b74-834c-4261-b1c2-eb17a5314b9a/features_of_the_ocean_floor_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8286/7383/files/electromagnetic_induction_formulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff05263d-953f-42f3-9e5e-c24d572bd20b/rituxaxabagoronofegewiwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9173/1649/files/lumbar_disc_herniation_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7f5380-4185-447a-8fcd-c4cdfdb7e38e/95753632629.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_off000064bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 5000 bytes
SHA-256: 37bba206420411f6a4e817b94c8ec7ea18cfd2accca200d0406c93e670a42936
font_01_sfnt_off000075da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DA 10988 bytes
SHA-256: 4fee30126518486d96f120b3d5ed29d3e7b5939c5a38f082ab690611e55e784d