Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac90d7f53bbc8fc…

MALICIOUS

PDF

38.5 KB Created: 2020-08-31 14:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1544d1f579f314edc1cf028f9033234 SHA-1: 74d92da24de627e2b686b905d476ee75b9865f66 SHA-256: 1ac90d7f53bbc8fca9eecfa139837f28e241b01ab1cf87992da501c068885e38
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=pythagorean+trigonometric+identities+worksheet'. This URL is embedded within the document body, suggesting an attempt to trick the user into navigating to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous other PDF links, while many resolve to benign Shopify URLs, indicates a link farm strategy, likely to obscure the malicious redirector.

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/wix?keyword=pythagorean+trigonometric+identities+worksheet
    • https://cdn.shopify.com/s/files/1/0447/8566/4166/files/89016725331.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/70655781796.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/secured_file_unlock_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wudogezemolajefenupil.pdf
    • https://cdn.shopify.com/s/files/1/0441/3777/5256/files/40539099314.pdf
    • https://cdn.shopify.com/s/files/1/0446/5996/6105/files/velekukasinugujidarut.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/79366186223.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/short_story_in_simple_past_tense.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/dojiwerugar.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/85911180614.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/jobapokamojuru.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1105/files/icelandic_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8019/files/windows_10_3d_objects_folder.pdf
    • https://cdn.shopify.com/s/files/1/0461/9124/7511/files/splash_screen_generator_android_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/ruwunumanuxawitapew.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/lejejulepawezikitora.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/mufevukefujegode.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_off00005636.bin
da454c1d11051ed59a4f3b6de0afb5b1a39680cd7aefa8ee549a6254379393ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5636 5580 bytes
font_01_sfnt_off0000691c.bin
bd316b8c59605b8128fa69a5125d6f112d59ff8c451b4e14e1608c8557c7d8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691C 10652 bytes

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