Malicious PDF — malware analysis report

Static analysis result for SHA-256 7037050ef42385c7…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 09:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a2b37d345bca41186d2a902ed751b46 SHA-1: 450b9a897efc3809c82e871daadd38e1d64957d3 SHA-256: 7037050ef42385c79df37c2eff389774672e9ebecdff2b2308f33bd48786789f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link, which points to a URL designed to lure users with a "kinematics worksheet" keyword. This link is presented as part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=kinematics+worksheet%2523+1+answer+key
    • http://files.alltexserviceco.com/uploads/1/3/2/7/132712333/dodujonasugam-jojilosak.pdf
    • http://files.mindls.com/uploads/1/3/1/1/131164152/kekupaguwoxilikosad.pdf
    • http://lavuxoz.csarevision.com/uploads/1/3/2/8/132816202/nurulanopoveba_ziguzuxojowixu.pdf
    • http://files.mayamitten.com/uploads/1/3/1/8/131871462/5475806.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3698/2952/files/basegowufarolisobi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/6000927600.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3585/files/fubudawozevavowedopaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/p90x3_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/a_successful_git_branching_model.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/food_chain_game.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/96276646142.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/bakesuzepagokezipubovanof.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/94406115407.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_off0000636f.bin
8bb860384cb5c4e84ec95ebae2d6b9903e2e1b86e2d1bc96fecb5d9af5dab961
pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 5132 bytes
font_01_sfnt_off000074bd.bin
8fc401e4c83cded180e596e97adb7e26735bcc65c73d11d152e8bb75d71258e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x74BD 10488 bytes