Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b0ca7931cb2f8b…

MALICIOUS

PDF

45.8 KB Created: 2020-08-07 23:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f54069bc5f8d29ee46023397b620852 SHA-1: 45b535a97424e1970cefc611420bc258b1fbcf12 SHA-256: 76b0ca7931cb2f8bdcd00e0fdd8ce92f07d37e09e1ac690769d39c0c5c73b7fa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same lure text and URLs as found in the heuristics, indicating a deliberate attempt to trick users into visiting the redirector. The PDF_SEO_LINK_FARM heuristic further suggests this is part of a larger campaign to generate traffic through SEO-optimized lures. 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=basic+guitar+chords+finger+placement+pdf
    • http://vipekuj.jonesybc.com/uploads/1/3/2/6/132695569/zejadobe-nabema-vogupidawobuka.pdf
    • http://files.saintanthonywoonsocket.org/uploads/1/3/2/6/132681670/mujewivifupisugez.pdf
    • http://debudazi.claritydoorsandwindows.co.uk/uploads/1/3/0/8/130813528/db304e61daaa5e.pdf
    • http://files.richstep.com.hk/uploads/1/3/1/3/131398334/00b5f365.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/87770474059.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5020/files/dabugitijinaxeladowusu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/17378304098.pdf
    • https://cdn.shopify.com/s/files/1/0429/7549/4300/files/number_theory_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/siforusuvebexiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/simbol_flowchart_dan_fungsinya.pdf
    • https://cdn.shopify.com/s/files/1/0440/5651/0616/files/nami_lol_build.pdf
    • https://cdn.shopify.com/s/files/1/0436/2502/1603/files/26221672734.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000678d.bin
6e32656f15e575f8976cfcd79512709c89d418a224325704040cf96a737b6c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x678D 5500 bytes
font_01_sfnt_off00007a0e.bin
c4f6d483647d5b1aa47b27d784a1e1ba352b0d584b3a3f15fad8b16265c4fdd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0E 9924 bytes
font_02_sfnt_off00009c06.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C06 4324 bytes