Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb6a4a7141c80e9…

MALICIOUS

PDF

53.8 KB Created: 2020-08-09 12:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1338b27df6afe95bed03f632c2370fe SHA-1: 18cc36fd122b68401a2312aaee2705f83ff1d0ca SHA-256: 5bb6a4a7141c80e9a8dd216f93cfce3a3fa1afa740270327331daf0f726ff467
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme, likely intended to lead users to malicious sites or distribute further malware. The ML classifier also strongly indicated maliciousness.

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=persona+bergman+script+pdf
    • http://files.gulnurozdaglar.com/uploads/1/3/2/3/132302913/38e83.pdf
    • http://files.gunnessfinancial.com/uploads/1/3/1/3/131384468/8082266d38.pdf
    • http://butozeki.dixieheritage.net/uploads/1/3/0/8/130874254/bfb7b68.pdf
    • http://files.thetaliving.com/uploads/1/3/0/7/130775747/povuranimek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/african_proverbs_and_their_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0432/6146/0644/files/tarrant_county_sample_ballot_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/7770754460.pdf
    • https://cdn.shopify.com/s/files/1/0431/4248/0021/files/919065213.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/83582582701.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/64670057700.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7075/files/57701615502.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/94571196303.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/daxen.pdf
    • https://cdn.shopify.com/s/files/1/0437/6546/5249/files/68879036059.pdf
    • https://cdn.shopify.com/s/files/1/0430/4853/4167/files/xerol.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/40244287472.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_off0000953c.bin
d3f8fd0add668ffc78f76362e561f26d696d10458ebaf402055d52060cb2e8d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x953C 5584 bytes
font_01_sfnt_off0000a81e.bin
284acbcbae14f14e7816f71ff13f26383d4f6a8e8403aa8879222c28748a8563
pdf-font-stream PDF embedded font (sfnt) at offset 0xA81E 9904 bytes