Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eeb31d4af25c34…

MALICIOUS

PDF

40.1 KB Created: 2020-08-04 07:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c02c44bc5a11f637186759c799d846bc SHA-1: 5c0856ba94ba8ec60f4572d9727ca83a3046db32 SHA-256: 28eeb31d4af25c34609c5b9a4fcca0015533068f74a45c56730b1911107eb684
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Affinity chromatography instrumentation pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=affinity+chromatography+instrumentation+pdf
    • http://files.wazyshairsalon.com/uploads/1/3/2/7/132740900/3588d5b99.pdf
    • http://files.nastrimt.com/uploads/1/3/2/7/132740623/vuwalewujijudu_godemexago_biguno.pdf
    • http://files.integralaerialsilk.com/uploads/1/3/0/7/130738572/42d6d224e769de.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/sefek.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6477/files/kered.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/34025465607.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/hoboken_nj_zip.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/pikerebemenomomag.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/60708279590.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kebiwubinixakagaxirefu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/nezis.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/xubifi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/16874461475.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e9c.bin
72deb79c676b0c6b6a6b15c1fb48de97f6709f23ce99aca022c43728dfe092b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9C 5628 bytes
font_01_sfnt_off000071ad.bin
aa370af66e3395f2e961fe2eeb9b6767badc318057190a3d453b880bb37f34f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AD 9880 bytes

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