Malicious PDF — malware analysis report

Static analysis result for SHA-256 04112f839a4abda2…

MALICIOUS

PDF

46.7 KB Created: 2020-08-07 14:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8088ea693af8f7a6ea4119e74396838a SHA-1: 9dba22e3f6fefcac35835b978c28ee1bb3a01083 SHA-256: 04112f839a4abda21f57824ee38a84109b07a6179ced922c66c0f77e623bf1d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to drawing lessons, but the embedded link redirects to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and PDF_SEO_LINK_FARM indicates a large number of outbound links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly indicated maliciousness.

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=basic+pencil+drawing+lessons+pdf
    • http://files.aya-technologies.com/uploads/1/3/0/8/130874129/zagelipaxef.pdf
    • http://files.everydayarteveryday.com/uploads/1/3/0/9/130969057/a904b0eecff.pdf
    • http://rivuzezab.paraschauhan.com/uploads/1/3/1/4/131482975/762562f6.pdf
    • http://files.pnhsanz.org.nz/uploads/1/3/1/4/131453054/c4e8b5ea74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0265/0020/files/1128013211.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/lonomare.pdf
    • https://cdn.shopify.com/s/files/1/0437/5435/6897/files/visadesekulolivuruj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/tikazosodogipaxonizeno.pdf
    • https://cdn.shopify.com/s/files/1/0438/2733/1232/files/totolofegufazulatajoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/25382839662.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/kuxamor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/13283456528.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/50231594932.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/boska_komedia_dantego_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/28024562747.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_off000078a0.bin
4d665f4d0005048b7f5dd3f5ecb9f91f04631f4071222edc33a5c34be5c20361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A0 5464 bytes
font_01_sfnt_off00008b59.bin
59ef1e13f79d1fbae3473accca9174e592b111e51edd7707c7c672960a8c2038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B59 10064 bytes

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