Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7643ae6f1e6852…

MALICIOUS

PDF

54.2 KB Created: 2020-07-29 17:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 874a2b01142ba5276c254e63628a5d4d SHA-1: d48a920e5e08cc3588e2853a7ed8389b3e251841 SHA-256: 6f7643ae6f1e6852bd6da2dec117b707bd2df2d9c31fb9e4e85fe4b1fa19ea58
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'definition laboratoire de biologie médicale pdf', suggesting a targeted phishing attempt. The presence of numerous Shopify links, while some are benign, indicates a link farm strategy to obscure the malicious redirector.

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.com/pify?keyword=d%25C3%25A9finition+laboratoire+de+biologie+m%25C3%25A9dicale+pdf
    • http://files.jmfenterprisesllc.com/uploads/1/3/1/6/131606169/wijoj.pdf
    • http://files.churchofhenniker.org/uploads/1/3/2/7/132740501/4591980.pdf
    • http://files.greaterfayettecountychamber.org/uploads/1/3/1/4/131408056/lokadumasup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/mozifofalokonalateguvuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/tadowol.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/mupasarekovifabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/jexukixazowarope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/tonipogeditiwexorevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53262414385.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/lajureripapuvazij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/naxinisetejiredomox.pdf
    • https://cdn.shopify.com/s/files/1/0437/2175/2731/files/ralavazikoso.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000923e.bin
9963df0909179481c40402dd61589d90bb94a5dfa653f19644aa7a216fd9f895
pdf-font-stream PDF embedded font (sfnt) at offset 0x923E 5364 bytes
font_01_sfnt_off0000a417.bin
ad620739c06ec8fe8c1d9b797d70427b392cd2420ebca3423464f086164a9be2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA417 11740 bytes