Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b27ec421b256fdd…

MALICIOUS

PDF

47.3 KB Created: 2020-08-12 07:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 792604924a2f6f8459bf8e85b27d387a SHA-1: c936d9f2956542c763a8a9b6f6835d16a008a584 SHA-256: 7b27ec421b256fdd7910f1701903bcf498ede8df14779b609fac81b3acb969c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body, though obfuscated, contains the same URL as the redirector, 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=list+of+borrowed+words+in+english+pdf
    • http://files.theteccas.com/uploads/1/3/1/4/131453946/ruzuj.pdf
    • http://sexaxeje.masterfreight.co.uk/uploads/1/3/0/8/130873804/zibifidaxajudi-zoxexus-noladumal-jusivowema.pdf
    • http://files.michaelsnowpresents.com/uploads/1/3/0/7/130740213/jadume.pdf
    • http://debowugif.sacredgeometryalchemy.com/uploads/1/3/1/6/131606349/gabagulerof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19194700937.pdf
    • https://cdn.shopify.com/s/files/1/0435/8212/8283/files/97413940474.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/76071245120.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/muthina_kathirikai_movie_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/6693/1862/files/92910999440.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/construction_supervisor_license.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/libro_los_axiomas_de_zurich.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/26162377595.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/taradedetudi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/58704205618.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/229905594.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/capital_city_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0134/0319/files/49285745430.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_off00006b06.bin
f9607ee40942c8eff78b8f9bba4536e788552026b0e2bb4b1b6c453efccdac61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B06 5056 bytes
font_01_sfnt_off00007c38.bin
ad08c108bc9ea0bdb4cd1854b1f1f5d80c2e6788811cf042fd14912e5335cd80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C38 11156 bytes
font_02_sfnt_off0000a217.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA217 4324 bytes

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