Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1af3251d146b4b9…

MALICIOUS

PDF

43.8 KB Created: 2020-08-08 15:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f048fab9dd50adca57eb454a907304b SHA-1: 2b16df8ac57602d398c6d71782fe7563a3478286 SHA-256: a1af3251d146b4b9de5fff898a73485a1fbe27491f0cca2e2e2b5021a196d11a
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, including a suspicious redirector URL and numerous links to Shopify-hosted PDFs, suggesting a phishing or malware distribution attempt.

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=catalogue+sacem+pdf
    • http://files.javacationrentals.com/uploads/1/3/1/4/131453100/c81418a3c884.pdf
    • http://lejog.alyssasinenitarot.com/uploads/1/3/0/7/130738732/mewididaxo.pdf
    • http://files.trowelmonkeys.com/uploads/1/3/1/3/131398385/d4781685.pdf
    • http://files.mhcgb.com/uploads/1/3/2/7/132741764/liderolo_xalamom.pdf
    • http://files.centeredbodywork.com/uploads/1/3/1/3/131379615/fetopekis.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/carrier_ethernet_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0438/8447/8632/files/bruchidius_incarnatus.pdf
    • https://cdn.shopify.com/s/files/1/0432/5608/6696/files/89114896731.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/23544774255.pdf
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/8527802316.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/20649092358.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/buwubafebafasizeduvurix.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/56828507887.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/mudutugijilopapumil.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/43755004596.pdf
    • https://cdn.shopify.com/s/files/1/0439/4736/0414/files/chemical_properties_of_aldehydes_and_ketones.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/vafubasa.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_off00006d42.bin
fbec07875d76596bee01f133b0a40b515860187b6705b5bae004913b7922469d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D42 5284 bytes
font_01_sfnt_off00007f2e.bin
1963bb474f3b23d157ef7be306218ae4b7786e219411eb5645146b18accbf4bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2E 10316 bytes