Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d90af9440b3bde…

MALICIOUS

PDF

57.9 KB Created: 2020-08-11 21:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca09cb09932ab3bf75e7b8cc7aaf440d SHA-1: 9d80d608f070060cf913d258f277ccdf05e05b2f SHA-256: f7d90af9440b3bde701464af522c27160ca36532d7309e78739b4332a676424a
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 indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'diagnosis of type 2 diabetes mellitus pdf' and the malicious URL. The primary malicious URL is 'https://ttraff.com/pify?keyword=diagnosis+of+type+2+diabetes+mellitus+pdf', which is likely used to redirect users to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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=diagnosis+of+type+2+diabetes+mellitus+pdf
    • http://gugun.unwindmassage.net/uploads/1/3/0/8/130874493/91ea35dc56450a.pdf
    • http://files.sprucemeadowschristmastrees.com/uploads/1/3/1/4/131406735/gidip-tovesujaboxijam-fujajelemep-gukorexo.pdf
    • http://jixizo.trentonchurchofgod.com/uploads/1/3/1/4/131407005/5b3f817f8dc9268.pdf
    • http://files.andineilands.com/uploads/1/3/1/4/131407227/4341354.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9126/files/nitagalib.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/fuditoloxesenoveluruvif.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/nuweb.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/rodetiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/10003139382.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/vidaguge.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/mukowatigowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6703/8106/files/98387547669.pdf
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/vovuxopixubigupelumig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/67576523053.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5276/files/agenda_setting_dalam_kebijakan_publik.pdf
    • https://cdn.shopify.com/s/files/1/0432/7905/7056/files/19234398032.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_off0000891a.bin
feb90c412ac2f654e8e6c9f365563334e32fd0ea3341f6afbc62d6193d5bb237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x891A 5520 bytes
font_01_sfnt_off00009bda.bin
b729362ece50ea454d62d606aa4278c6250a918079abb13c6e35bda8df0de782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDA 14424 bytes
font_02_sfnt_off0000c975.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 4324 bytes

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