Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d487728b72ae51…

MALICIOUS

PDF

44.2 KB Created: 2020-08-26 07:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e48d1c207d3eaec0f8d6e584c78ce286 SHA-1: 36a83b942d74f62aee17a1d89c2c4ac945c4b335 SHA-256: 37d487728b72ae51e4d0774cb4b02b1adaf225e6742ec01113276ae7538896de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=joshua+graham+armor'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector and the link farm strongly suggests a phishing or malware delivery attempt.

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=joshua+graham+armor
    • http://files.diannebersea.com/uploads/1/3/1/8/131856277/geduditenabav_duvovawopage_digenamexex.pdf
    • http://bizited.somaragdolls.com/uploads/1/3/2/7/132740214/0a914d60783433b.pdf
    • http://files.shaluksgardensolutions.com/uploads/1/3/0/8/130814042/netudexutu.pdf
    • http://files.quranhomepro.com/uploads/1/3/1/8/131871424/b7a443.pdf
    • http://files.nannypalooza.com/uploads/1/3/0/8/130814126/tululamexape_fakudogatogon_regugekad.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/gomujiwobiposirubaruko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/javascript_extend_function.pdf
    • https://cdn.shopify.com/s/files/1/0434/5643/0230/files/duskborne_aethersand_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/39879217756.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/58842816660.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/chupana_bhi_nahi_aata.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/nokeximilutelovixowita.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0104/files/gikegosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/potafanoki.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/65514022264.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_off0000632c.bin
27d57faeee4332cec3af9892ebc916e005d76fe1fed148753e30483d2d94ee24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632C 4584 bytes
font_01_sfnt_off000072aa.bin
af0ebc966f9e7f88c9cb2cf3f5e62140cede20adfeb772d5e88cbba3645eb981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AA 10380 bytes
font_02_sfnt_off000095ef.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95EF 4324 bytes

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