Malicious PDF — malware analysis report

Static analysis result for SHA-256 15088ddb1b4dbcd1…

MALICIOUS

PDF

53.5 KB Created: 2020-08-21 18:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66d724a072941b14f99ebfd51fab63f0 SHA-1: 0ef29286fc5825689328d2ac88887ecfc5921035 SHA-256: 15088ddb1b4dbcd17622127fc66f18e21320ea669d0934ffd799014f3b10e2d5
162 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=ssc+chsl+typing+test+admit+card'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, likely used to obscure the malicious one. The presence of a 'download button' lure further supports a phishing or scam attempt.

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.
  • 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://ttraff.ru/pify?keyword=ssc+chsl+typing+test+admit+card
    • http://files.foursideddesign.com/uploads/1/3/1/3/131379706/furelijeti.pdf
    • http://files.calmundertension.com/uploads/1/3/1/1/131163782/pepagitat_xokivoku_duxojisirilavix_wadixog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/combat_knife_ragnarok_quest_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/2041/7181/files/largest_cities_in_north_america.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/roxikevinikidugopowomobet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/25070252653.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/jadirofom.pdf
    • https://cdn.shopify.com/s/files/1/0431/7213/5074/files/mapekutugusuna.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/30663631789.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/public_holidays_2020_nsw.pdf
    • https://cdn.shopify.com/s/files/1/0428/1516/0487/files/sakasaxoxuredalerekot.pdf
    • https://cdn.shopify.com/s/files/1/0438/6412/9696/files/suvukifilamofose.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/18238131715.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/xuvodifubolava.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6264/files/90276866356.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092ad.bin
d82d24b02de5d061ed7f25835d9653ba9dd1d75dafa8fe325e4e6b187909ef40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AD 5692 bytes
font_01_sfnt_off0000a5d8.bin
7c41275b6889884c4d45b5c95176173a388091b5ab8ff9437d45f8d5b8500f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D8 10208 bytes

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