Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ec516fad7e32c9…

MALICIOUS

PDF

41.4 KB Created: 2020-08-06 06:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc7a3836f0bf6511a9711b16b2d5364a SHA-1: 3697a7d772ca934fdc32714b0b82678451974fb5 SHA-256: 99ec516fad7e32c9384d0930b26a029515895382f3fed4702c79efb419faac0d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly supports a malicious verdict. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a SEO-based malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wb?keyword=reflection%20math%20worksheets%20pdf
    • http://files.yoursecondopinionllc.com/uploads/1/3/0/7/130740033/kojorevi_niriwegare_regedirosowaju_mebipu.pdf
    • http://files.jjsatthecopperpot.shop/uploads/1/3/1/8/131856276/ec874ec631.pdf
    • http://files.joannerichards.life/uploads/1/3/0/8/130873908/feruwozakuzo_suwosapidani.pdf
    • http://files.creative-loop.net/uploads/1/3/0/7/130738889/6b6df46c882cea3.pdf
    • http://kuboxabi.cooperlaifineart.com/uploads/1/3/0/7/130740510/felaberajexibese.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/adding_fractions_with_different_denominator_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7275/files/doxazubatoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tifomev.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/degajapuziguk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/28794385155.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/levugomuwaritub.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/xowudik.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/worizijitowoken.pdf
    • https://cdn.shopify.com/s/files/1/0434/2169/6149/files/saturday_night_misfits.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8156/files/zurarunojiworidaburofana.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/37892090896.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/vired.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645e.bin
6d7e03114c40dbaab1b5c88b3e2f2e08dfa191a5426670c93dfc0649973d43e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 5560 bytes
font_01_sfnt_off00007734.bin
ce12d2f98721d7082045ea39aba8cf27720ac73f78d95cb081068fbafb05c529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7734 9792 bytes

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