Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b40403dffa1d9d9…

MALICIOUS

PDF

65.2 KB Created: 2020-08-28 07:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d93b2bd819fdec14349dcefa2abd7a41 SHA-1: 51861d238820e970a0b84e6c2616811e2b4114d6 SHA-256: 8b40403dffa1d9d9c463302cd5aa5caccbd31a1f4e190d4b10ce5d2126b7cccb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=impersonal+passive+voice+exercises+p'. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is a strong indicator of a phishing or redirection attack.

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.ru/pify?keyword=impersonal+passive+voice+exercises+p
    • http://wiraw.francescafitzeventing.com/uploads/1/3/0/9/130969972/1badbff29c.pdf
    • http://files.brunomacdonald.com/uploads/1/3/1/6/131636772/kobamu-mesoxemo.pdf
    • http://neriwodes.brandonroberteck.com/uploads/1/3/1/3/131383813/4965595.pdf
    • http://files.brunomacdonald.com/uploads/1/3/1/6/13163
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/sims_4_manual_patch.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0434/2828/2529/files/autotune_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/6046/0706/files/plataforma_20_aula_digital_aluno.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/xemidubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/buwadetuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/82664358738.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2775/files/letter_tracing_worksheets_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/97992523789.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/hilbert_transform_for_ssb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/fegijavijukejagodemixesap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/animal_kingdom_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/31595473320.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/sixagibitinukexed.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2a1.bin
8e723f20154c43cb317d9603d43c159a2215b253b5f962dd5020049dcfdf2f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 5144 bytes
font_01_sfnt_off0000d407.bin
da52cd4a90184213f0e972aa7e593f5c2a5c44328f17fc288b83ea01613cfda3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 10292 bytes

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