Malicious PDF — malware analysis report

Static analysis result for SHA-256 62474bd6b6cc56a6…

MALICIOUS

PDF

81.8 KB Created: 2020-08-14 03:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8a9bb9b1fb03a3da40f35f530a220b9 SHA-1: 9854d28ee7c12c4fc9b4b9b3c8936b625051a57c SHA-256: 62474bd6b6cc56a69509373ad434da297b49b39c0499e1529b817b33854913e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files hosted on Shopify. One prominent link, presented as a 'free mla format bibliography generator', redirects to a malicious domain (ttraff.com). This suggests a link farm or SEO manipulation tactic to distribute 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.com/pify?keyword=free+mla+format+bibliography+generator
    • http://files.belgianhareclub.com/uploads/1/3/1/8/131858791/tuxewafirodaw_gudefep_bevokopoboweten_kuvotalub.pdf
    • http://kojonip.newincomastires.com/uploads/1/3/1/4/131407668/13105d174c8b.pdf
    • http://dodipadi.operationfeedsjc.org/uploads/1/3/1/4/131437657/nakigitotuzol.pdf
    • http://gugabox.gannonjwattscounseling.com/uploads/1/3/1/0/131069839/3409975.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/gofotoperidavuto.pdf
    • https://cdn.shopify.com/s/files/1/0448/4051/7793/files/38903957683.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/lincoln_welders_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0437/6143/4773/files/deadpool_kills_the_marvel_universe_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/gafibetozumatixesisa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3817/8470/files/stopwords._words_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/2916/8282/files/vobinuwodesexal.pdf
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/after_2_gratis_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/4679/5424/files/university_of_alberta_course_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/nolope.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0095/files/35802557442.pdf
    • https://cdn.shopify.com/s/files/1/0429/2267/2284/files/greystones_guide_la_touche.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2376/files/foridonuvef.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_off000100e2.bin
2526f8ddf49c6e3f45fd58e90077eb0ec7012eeec76b16dab239747253980d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 5336 bytes
font_01_sfnt_off000112ed.bin
66ebae61ebb7e0ff053bd55a18dc53c462c7fc99a8dce7fdf554f3dcd4db1e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 11512 bytes

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