Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6af62c909daa02…

MALICIOUS

PDF

42.1 KB Created: 2020-09-04 15:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52389c9e9f5a93a021b52ee0c9a2cf4b SHA-1: caabdbd7e487174bd940fe57630c81ffac231039 SHA-256: 7e6af62c909daa02633710818ca9086a052382ece16777d7cb2c41d6bdc457f5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, with one specifically pointing to a known malicious redirector. This heuristic, combined with the ML classifier flagging the PDF as malicious, indicates an attempt to redirect users to harmful content. The document body itself is heavily obfuscated but contains a URL similar to the one identified by the heuristic, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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.club/wix?keyword=laws+of+apartheid+in+south+africa+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d5415a_aed1ec914bff45169c8518c572f19866.pdf
    • https://static.usrfiles.com/ugd/afe78f_411c280c951d43c0a8c8f1cd28a2cbc1.pdf
    • https://static.usrfiles.com/ugd/25c42e_1db7a1fe787b46b29ff5e61a6e245a72.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/boosie_no_juice_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/7926/8520/files/55169746742.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/divusufelekovunepajorumel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30347825404.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/kikixeganidilikufiku.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/aliphatic_and_aromatic_compound.pdf
    • https://cdn.shopify.com/s/files/1/0435/3445/0840/files/sarefereduduwibilaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/pubasujarudewuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/2600/4642/files/amsoil_oil_filter_cross_reference_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/lozegumovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/virgil_abloh_figures_of_speech.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7142/files/janefezaradimivad.pdf
    • https://cdn.shopify.com/s/files/1/0437/5740/4318/files/biochemistry_and_biophysics_book.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_off000065b8.bin
b8c0365322f4272983e29dd9f861e738bc096b2205a51998a8f3d5f86a474f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B8 5244 bytes
font_01_sfnt_off000077a3.bin
46d2fa73e1016a9e2a46a9d48f5ebb75cd5184cf4fb89407acc534f4cd1de257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A3 10504 bytes

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