Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8737dbeb04b2971…

MALICIOUS

PDF

45.6 KB Created: 2020-08-20 08:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad3be2e7f939e1caaed5060a8e31507b SHA-1: 0652e76733382bfeb26f45c0635963fa2ddeaa01 SHA-256: f8737dbeb04b2971cfd087cff045748177f500cc257727557507533990ab763c
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm. The embedded URL points to a redirector that uses a keyword-based URL structure, suggesting a phishing or SEO poisoning lure. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=baba+balak+nath+songs++punjabi
    • http://files.ncbrookhaven.com/uploads/1/3/1/4/131482975/gaguvijomimodopemole.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7743/files/62068502398.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/pukoburog.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2659/files/android_auto_app_for_ios.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9520/files/should_mobile_phones_be_allowed_in_school_debate.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/53898603532.pdf
    • https://cdn.shopify.com/s/files/1/0430/6573/7370/files/55051181883.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/20035434074.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/79408559015.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000756f.bin
e0ea219ed2bf25a008cf60f924f90e176207793db7f0935152d343293baaa8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756F 5312 bytes
font_01_sfnt_off00008781.bin
8638787e7a5197fabed68dbf8b2967159e757517ad54e5f71331270d9f5fe9a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8781 13900 bytes

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