Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f257aaefc8f1a7…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 22:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a8ee38ae08584a4073d498f47968a78 SHA-1: 8caa75ebdecb1929f3e76f6163afc4bcedda4492 SHA-256: 30f257aaefc8f1a7042a6a87a5cde660b6ee83e7c8003970d82e6a02c97068f7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded links, with one prominently pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'Alldata repair online study sheet'. The presence of numerous external PDF links, many hosted on Shopify and static.usrfiles.com, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=alldata+repair+online+study+sheet
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/nolutaxijuxut.pdf
    • https://cdn.shopify.com/s/files/1/0437/1726/3510/files/description_of_andrographis_paniculata.pdf
    • https://cdn.shopify.com/s/files/1/0465/0087/2344/files/temosujufafebipoto.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/on_duplicate_key_update.pdf
    • https://static.usrfiles.com/ugd/b8c837_dacb405f5c0948269e918c9157dbddd1.pdf
    • https://static.usrfiles.com/ugd/33ab24_fe8f2d9212aa4296bafd56aa2b7339d4.pdf
    • https://static.usrfiles.com/ugd/837d34_5ccedf20420a4e7c84b18c4090e7a137.pdf
    • https://static.usrfiles.com/ugd/b27199_4ca92733a66f422981144fa02b858c33.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cfe5a9e99e744bb962bd9832dc66cee.pdf
    • https://static.usrfiles.com/ugd/575363_41c43d88a19f413ea1e8a3a77dc6816b.pdf
    • https://static.usrfiles.com/ugd/b5472a_76cc3f80e51b471ca59e2a995433d16a.pdf
    • https://static.usrfiles.com/ugd/b8c837_758a16ec0518498996994908b41602d4.pdf
    • https://cdn.shopify.com/s/files/1/0448/0407/9777/files/basic_english_words_for_daily_use.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/20134562025.pdf
    • https://cdn.shopify.com/s/files/1/0462/8483/2928/files/pikekojovafemoxedar.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/imperial_city_prison_eso_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/gowujetejakagafoxul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e95.bin
a2dfd27db344ac17f0a20dfe3133cec8998128fb72fddd84d1a017c741950c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E95 5020 bytes
font_01_sfnt_off00006f98.bin
3625230f98118513c701b4fd95a1f561b11d4f865fa60f1aa358f9f57e7ae08e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F98 10676 bytes
font_02_sfnt_off000093be.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93BE 4324 bytes

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