Malicious PDF — malware analysis report

Static analysis result for SHA-256 25347c911f4dfdf1…

MALICIOUS

PDF

39.0 KB Created: 2020-08-03 22:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e6b0a2305f68140685f6090f2173f1 SHA-1: c07632c172d429854081940ae15f4d3d7e2b6aeb SHA-256: 25347c911f4dfdf1f0dd881f4d1abb586252207d7564bcf559cafe8f5f01b93d
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=february+2020+blank+calendar+pdf'. The document body, though partially obfuscated, also contains this URL, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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=february+2020+blank+calendar+pdf
    • http://files.bootsanddiamonds.org/uploads/1/3/2/6/132695531/2235663.pdf
    • http://sefukotug.dalhousieparentsdaycare.ca/uploads/1/3/0/8/130814124/0f14ec1f9b480.pdf
    • http://files.tropicalduckies.com/uploads/1/3/1/1/131164574/kiribu.pdf
    • http://files.catchacomamarina.com/uploads/1/3/0/8/130874432/vijavumupixi.pdf
    • http://files.saynomoremultimedia.com/uploads/1/3/0/9/130969580/juliviwitupujoputi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/39434721976.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/famepekofegifev.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/wileyplus_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/3410174985.pdf
    • https://cdn.shopify.com/s/files/1/0436/5333/3145/files/best_book_for_analytic_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/nitotupalasopixil.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/pimelijurepawavolefox.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/ascii_thumbs_up.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/84205039775.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_off00005885.bin
45288fea477eb546e468f584c77b853e10b446a0432f17f3f3413c12f21bc100
pdf-font-stream PDF embedded font (sfnt) at offset 0x5885 5508 bytes
font_01_sfnt_off00006b58.bin
0cc749a18951861f9ca46bbde8aa2b8b35ae7d8190f56087916a62caf395d50d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B58 10628 bytes