Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4d0903e900f560…

MALICIOUS

PDF

59.1 KB Created: 2020-08-08 00:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db8bb91b527fbe588040f2f78fcf4459 SHA-1: e45042d0e5d230f7f886f8db8352c41ec2f427bc SHA-256: 0c4d0903e900f560af6bc73cf503935f7e8d4a5ab4704d85fa08b6759ea5357b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the presence of a large number of external PDF links, indicative of a link farm. The document body, though heavily obfuscated, contains text that, when combined with the heuristics, strongly suggests an advance-fee scam lure. The primary IOC is the malicious redirector URL.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=english+story+for+reading+pdf
    • http://files.captainstinkyandsailorpuss.com/uploads/1/3/1/4/131437394/negorikov-fakadelivadiw-funiwuxuvew.pdf
    • http://files.upstagenydanceacademy.com/uploads/1/3/0/9/130969573/3364135.pdf
    • http://files.kathleenstuartart.com/uploads/1/3/1/1/131163856/69cd1520e22eea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/86311565132.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/3842807996.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/ronawukos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/dajexisuwebotafutilesuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/81801572498.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/wonixidinupofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/39231752153.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0319/files/39413751287.pdf
    • https://cdn.shopify.com/s/files/1/0437/1536/2984/files/durofixun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1687/files/simple_python_programs.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/frenzied_knife_fang_wow.pdf
    • https://cdn.shopify.com/s/files/1/0438/0078/9154/files/2000_yamaha_v_star_650.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_off00009d18.bin
c0fc0e45e45b3be6f1f24c49549c0e612927c15ae81221ab723ddb78b22f2b48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D18 5152 bytes
font_01_sfnt_off0000ae9d.bin
62a824023c3ac47ed969b24b07c4d65bb7d73195bcc7c0aa163a41732ecd5018		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9D 10072 bytes
font_02_sfnt_off0000d11d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 4324 bytes

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