Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcdd12c768a1042…

MALICIOUS

PDF

40.2 KB Created: 2020-08-08 21:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2682d2574a1699fecfc21e45d6ce0157 SHA-1: 4407676cf8c963be21a5cc13ddffe13a569e57fb SHA-256: 5bcdd12c768a1042e73f82fd3b8ec854b6f614ac2a6c44c21ba78e1b31aafbfc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector (ttraff.com). The document body, though partially corrupted, contains text related to 'Mindfulness in social psychology pdf' and references wkhtmltopdf, suggesting a lure to disguise malicious links as academic resources. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a phishing or link-farming campaign. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest an attempt to redirect users to malicious sites, likely as part of a broader phishing effort.

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/wb?keyword=mindfulness%20in%20social%20psychology%20pdf
    • http://files.lockmangenetics.com/uploads/1/3/0/7/130775383/nizejab.pdf
    • http://files.yez.dk/uploads/1/3/1/1/131164047/4386632.pdf
    • http://files.puertoricanparade.org/uploads/1/3/1/3/131382217/272f61714.pdf
    • http://files.wrightthewriter.com/uploads/1/3/1/4/131453111/vutiv_suvemetej_minobekugiji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1289/7437/files/89898447874.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5919/files/corona_sdk_game_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/43590571361.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/asma_cardiaca.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3893/files/54847575176.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/analytical_mechanics_fowles_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9767/0303/files/sowexejokesoteluri.pdf
    • https://cdn.shopify.com/s/files/1/0435/5712/6295/files/rapusipagajovofojozizov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/zonaviginafuka.pdf
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/cisco_ip_phone_spa504g_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6369/7817/files/lcsw_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/fekarulanasilegezer.pdf
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/tupenakevipazopugaw.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_off00006081.bin
a680c843622e6de5e23ad31a43ffe6a1d8b95686be72e567809478658ebb57e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6081 5428 bytes
font_01_sfnt_off00007317.bin
6fcc13229bcecf2fd6c7e307cfbdeb86a693f68b992c09e020536532197cc898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7317 9544 bytes

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