Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ad5478946a1e9f…

MALICIOUS

PDF

38.1 KB Created: 2020-08-01 14:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a4f2d26d5d474aba5fd856a45d43af4 SHA-1: 7ff40728eed56b4bab023cabd77ad5be258bf546 SHA-256: 11ad5478946a1e9f4dae8a2b91b2f088f901b570bb66d7299261343571a74ec3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=fire+emblem+sword+of+seal+rom', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it under the guise of downloading a game ROM. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=fire+emblem+sword+of+seal+rom
    • http://files.chriscaddellmusic.com/uploads/1/3/0/9/130969452/7329419.pdf
    • http://files.susefarms.com/uploads/1/3/0/8/130874254/8134125.pdf
    • http://files.myrules4life.com/uploads/1/3/1/4/131437755/xigonir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/gozanidolafofatuzexeduf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7283/files/bolivutolatigit.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/ravenloft_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/dibujowetogadofi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/wesulonofapobixifametug.pdf
    • https://cdn.shopify.com/s/files/1/0433/9689/0785/files/78458352901.pdf
    • https://cdn.shopify.com/s/files/1/0437/5366/8769/files/pi_in_hex.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/bofuxipatoruwan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2111/files/10408550789.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/70781395432.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a9c.bin
22c57d44c0caa7ffed71eb5e6229105b17e39dba7db245bb77fdefe89f204429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9C 4840 bytes
font_01_sfnt_off00005b12.bin
13abb43f0e9e2886b96859cc2a2552e64276ceee9733e482ddc3a6e5da050115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B12 10064 bytes
font_02_sfnt_off00007d60.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D60 4324 bytes

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