Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb0bcbe8af07b00…

MALICIOUS

PDF

37.7 KB Created: 2020-08-14 16:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22036e57f152eca4a52ac3d15e6c0a91 SHA-1: 6686d88fc23bd4122c831d864b1274a276c3cd53 SHA-256: 0cb0bcbe8af07b00ea6fb3506b4c18206c8980ca853073d67106a3f14bef6b40
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a malicious redirector, which in turn points to a large collection of other PDFs. This behavior is indicative of a link farm or SEO poisoning attack, likely intended to drive traffic to malicious infrastructure. 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.ru/pify?keyword=fischer+fire+foam+data+sheet
    • http://files.missionalworship.com/uploads/1/3/2/3/132302764/0aa1000e9.pdf
    • http://ropuve.thegallerysociety.com/uploads/1/3/0/7/130775666/8072914.pdf
    • http://fajisa.alabamahunterjumpers.org/uploads/1/3/1/4/131453384/gulesa.pdf
    • http://files.fearlesscounselingservices.com/uploads/1/3/0/7/130775102/7459c3f28636.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/e_banking_wikipedia.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/finneas_break_my_heart_again_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/rozamilen.pdf
    • https://cdn.shopify.com/s/files/1/0439/4103/6200/files/jailbreak_tool_apple_tv_3.pdf
    • https://cdn.shopify.com/s/files/1/0434/6865/2697/files/cao_1_2020_brokerage_fee.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/zojasapudagonegugofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/lasojat.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8469/files/79680664955.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6951/files/base64_encode_file_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/govadokuret.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049d1.bin
a17fb4a80d886d08dd0c342222295c43ef296282572ea04b6b0e0cf35ad02f5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x49D1 4864 bytes
font_01_sfnt_off00005a52.bin
5f15b532104d81600ae49792e80c6683e087b542a20bcaa738388c4f27f1ae23
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A52 9832 bytes
font_02_sfnt_off00007bda.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDA 4324 bytes