Malicious PDF — malware analysis report

Static analysis result for SHA-256 995caa8526e4628d…

MALICIOUS

PDF

67.2 KB Created: 2020-08-06 09:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab6668ac585c7ac95c312d5213de3032 SHA-1: 35483ff7f9c892aa317a1eeb101ca1f67f0fee6b SHA-256: 995caa8526e4628d5e1f07168a067f5476268ea6dd20b69c1b84abf941964e0f
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. This suggests the primary goal is to redirect the user to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted from this sample.

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=shimura+introduction+to+the+arithmetic+theory+of+automorphic+functions+pdf
    • http://files.chocolate5krun.com/uploads/1/3/1/4/131437612/betaduwajitovisud.pdf
    • http://files.saintjosephparish.org/uploads/1/3/1/3/131378999/peboba-fodugiwovujege-waxepafage-sulanawejolum.pdf
    • http://files.masteryourchess.com/uploads/1/3/1/3/131381363/0a7e9c6d48d523b.pdf
    • http://jotow.theabnormallife.com/uploads/1/3/0/8/130873951/lapuxuxaxozibe_zapuligepavef_walogadolasu_jawebupot.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8365/files/68153070808.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/nevojuvaxenuwotevigudoju.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/mortgage_approval_letter.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/xasupaxinuzowafag.pdf
    • https://cdn.shopify.com/s/files/1/0435/1908/2651/files/lariparurowexukal.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/59589630989.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/fusekofezapepubudugilizob.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/extract_audio_from_video_online.pdf
    • https://cdn.shopify.com/s/files/1/0447/3035/1770/files/sample_application_letter_for_teachers_fresh_graduate.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/brachistochrone_problem_solution.pdf
    • https://cdn.shopify.com/s/files/1/0434/7206/0573/files/padala.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_off0000bf9c.bin
cba24c03cc199c319b2b1b293ec9ffd8ec3a64e998b2e6d4dfdfed79ecb1feca
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9C 5568 bytes
font_01_sfnt_off0000d268.bin
2792a16cc1509db76f8e067f21146cc7d6b7eaa4ec9ad769a7539a856c35514d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 14168 bytes