Malicious PDF — malware analysis report

Static analysis result for SHA-256 1345bdeaaa83c3ae…

MALICIOUS

PDF

67.5 KB Created: 2020-08-03 17:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20138b17efd88ad208a02ebd5c1f74df SHA-1: 4d3250918edc4afb3f648143ed6d5c4bd7d665fb SHA-256: 1345bdeaaa83c3ae7d262126f61a1b26c313eec05b879df978a8b9f2feda4b80
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it for a document summary. The presence of numerous external PDF links also indicates a link farm, potentially for SEO manipulation or to host further malicious content.

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=bartleby+el+escribiente+resumen+pdf
    • http://zoxeseje.irondalelax.com/uploads/1/3/0/9/130969656/duwitup-polunet-detuvola.pdf
    • http://files.onepercentlegal.com/uploads/1/3/0/7/130775373/8603363.pdf
    • http://files.leiydbeauties.com/uploads/1/3/2/6/132682142/0faffb39.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/bow_of_eternal_frost.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/wutije.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3295/files/danixirazesa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1758/5308/files/wikexipudamovobofon.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/firabutazivamibutisizugo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/pevomuxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/3371703179.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxolalinurijelibabozafod.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/47053201552.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/24455023286.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9de.bin
d762b49d9dbb8013d2e74c9c5cf0808fa406ee922dd2658d7336561004121394		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 5364 bytes
font_01_sfnt_off0000cbff.bin
a89fdc7ba354f80e4769cf222661332c0e5cb04eed48799f9d9c10f2bb0c9af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 11260 bytes
font_02_sfnt_off0000f0c3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 4324 bytes

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