Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f80027ca765d22…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 17:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15866e82b634582c3a74edea8a9d4607 SHA-1: cab0c6dc4819fcd9a679d90447761e59d127bec4 SHA-256: 41f80027ca765d2290937d25035697ac67093f1941325e4dfd8f1fe5aef29ae9
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 firing for a malicious redirector. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=design+thinking+pdf+book', suggesting a lure to a malicious site. 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.com/pify?keyword=design+thinking+pdf+book
    • http://files.quillandpapercalligraphy.com/uploads/1/3/1/4/131406781/zaduvufunefujikeb.pdf
    • http://modozokag.vickylneal.com/uploads/1/3/0/8/130874063/vaziletuledixud_jepobeburukufol_nezigesobowi.pdf
    • http://files.santorolaw.org/uploads/1/3/1/1/131163507/lexugewinasuwerada.pdf
    • http://files.pacecoachingandwellness.com/uploads/1/3/1/8/131856569/4226514.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kixekitigatozodevejale.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3988/files/gixasujawadurufe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1641/3607/files/77817061428.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/54822313369.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6914/files/posakozok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/68803165387.pdf
    • https://cdn.shopify.com/s/files/1/0429/3761/4499/files/baguxuxobozajilazaropiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/vajamaxawefanubuvoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/xawuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/5697/2455/files/16907170095.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1718/files/tibob.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_off000067fd.bin
99fa6aedd98aaf0099f2b237009d2502f3e35d1b0977deb40aa6e07d221c3b2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x67FD 5168 bytes
font_01_sfnt_off00007998.bin
628e5e9c871c4755df442a374e9e66f5c0ec7443f27c7a0e2f6a14dfd2d689b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7998 9984 bytes