Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f21f35c6d74947…

MALICIOUS

PDF

51.3 KB Created: 2020-08-20 18:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af1af3a31e30137bbe9cde8fd3fe7337 SHA-1: ebf7c0db3332155fe3fb0a032aadfc02b376ce60 SHA-256: 82f21f35c6d749473fb4639915475f764e33c16446d1d04c92e286b3b205143d
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector URL to 'ttraff.com', suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains the same redirector URL and keywords related to programming tutorials, likely intended to deceive users into clicking. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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=vb.+net+crystal+report+tutorial+pdf
    • http://files.kerenzaltz.com/uploads/1/3/2/6/132695832/1e41a73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8223/4521/files/65076038267.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/94711161573.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/facebook_cover_photo_template_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0438/4659/8821/files/pisogulivowurakon.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8726/files/vemuxumux.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/mabinogi_musical_knowledge.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/roxasebavepolimu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/livros_apocrifos_baixar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/tofesadosudipiginimozewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/loxibadinipono.pdf
    • https://cdn.shopify.com/s/files/1/0430/5721/7693/files/55270812362.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/xananupowotog.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_off00008b81.bin
3e8f662a42e3df81a8c56d5c2ad9cf18e5670d74f3e7708c2c3cb5e4327f07c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B81 5388 bytes
font_01_sfnt_off00009de0.bin
eac7b1057f9d23d55050279b5b7adc9087ea814f6739bffed45441a41020a976
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE0 10024 bytes