Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b75fd95ee685b29…

MALICIOUS

PDF

66.3 KB Created: 2020-08-12 09:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d421510294396e6a11018ff27c74af38 SHA-1: e99a985a28202eff280d3679a49db73dba7b6dcb SHA-256: 6b75fd95ee685b292fa061f5c0366780088c408ff8739a8c9d0dd4e6ddf47082
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to interview questions and a URL that appears to be part of a link farm designed to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is intended to redirect users to harmful infrastructure.

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/wb?keyword=star%20interview%20questions%20and%20answers%20examples%20pdf
    • http://files.dakotasdogs.com/uploads/1/3/1/4/131438453/befotoju.pdf
    • http://files.francesalleblas.com/uploads/1/3/1/3/131379049/resotigodebi_xiseje.pdf
    • http://safewop.vellichorshop.com/uploads/1/3/1/6/131606457/morizarupopafa-mogegi-jazarosagel-suwakixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8238/9406/files/babylon_s_ashes.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/jogasejegexajisefubofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0327/files/amoeba_sisters_video_recap_pedigrees_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/92044789610.pdf
    • https://cdn.shopify.com/s/files/1/0434/1835/3821/files/macroeconomics_jones_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/1725/5581/files/managing_business_process_flows.pdf
    • https://cdn.shopify.com/s/files/1/0439/1917/9944/files/introduction_to_anthropology_psychology_and_sociology.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/wudikogowirub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0844/files/39240931817.pdf
    • https://cdn.shopify.com/s/files/1/0428/1758/5308/files/21334440628.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/boss_dd-_20.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_off0000c4fd.bin
06a993cef2bde04e49071de4faffbd1c1b92d8cf12e1cbe163ee8709ea042174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FD 5636 bytes
font_01_sfnt_off0000d823.bin
3ecbd241d34fed3d45f24749c732edd52d0f4e5ec8244974e242c0fff7c8878c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 10468 bytes

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