Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c7a26c69cbc3e3…

MALICIOUS

PDF

117.4 KB Created: 2020-08-21 17:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 807b3df7603bc8c4edaa234bea8f8a88 SHA-1: 4dcd629d4f48f653046b39767ef3d40e68fa0f13 SHA-256: 62c7a26c69cbc3e3816142720d9a3bc23cc0a6058072b283ae4dd0c59de334e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL, suggesting an attempt to manipulate search engine results or lure users to malicious content. 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=big+bang+theory+characters+fight+list+answers
    • http://lebavo.livingwithachoice.com/uploads/1/3/1/4/131453134/01161af2.pdf
    • http://files.littleflowerfloraldesign.com/uploads/1/3/0/7/130738919/wikelarosap_timipojufes_zurugonokorola.pdf
    • http://fepelipuz.knotyourgirl.ca/uploads/1/3/1/8/131855997/nitaxefuwaxu_mumifazonoxem_majid.pdf
    • http://files.dancelikeacupcake.com/uploads/1/3/1/6/131606118/mapikelibezamuk.pdf
    • http://rufuranav.philmancusi.com/uploads/1/3/2/7/132710714/degotuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/git_stash_drop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/tuzupejuxevazexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datufezon.pdf
    • https://cdn.shopify.com/s/files/1/0433/3522/1403/files/40th_bcs_result_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5049/9222/files/89858070271.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/58572688830.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4835/files/belkin_and_arcadyan_algorithm_apk.pdf
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/que_es_ansiedad_generalizada.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/farerijeboxunimop.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/95472599415.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7719/files/tamil_to_english_spoken_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/54771091829.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_off000191a2.bin
f9840d96d4a1f678b6d351f0bb731a5134c2590cbfcf412ea46c6d48c6101353		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191A2 5524 bytes
font_01_sfnt_off0001a47f.bin
d766aec2509b88ecb9e3521bca45e5ddb138b05b695ea3b2e45fa2a999d55266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A47F 10352 bytes

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