Malicious PDF — malware analysis report

Static analysis result for SHA-256 828b33bee33543ee…

MALICIOUS

PDF

45.9 KB Created: 2020-08-01 09:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04ac22e61889c46c59249f6418b0ddbd SHA-1: d95a01b07175f4b7ad74ea134d9a72796effc53a SHA-256: 828b33bee33543eee34272eca88297a0dea40b5625698864bfe58f5119850670
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one that directs to a known malicious redirector infrastructure. The document body, though obfuscated, contains a reference to the malicious URL, suggesting a lure to trick users into clicking. The presence of many external PDF links indicates a link farm or redirection scheme designed to obscure the ultimate destination.

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=academic+appeal+letter+sample
    • http://files.traughberlaw.com/uploads/1/3/2/6/132695288/dewaregun-rolexufulerud.pdf
    • http://files.childproofingcolorado.com/uploads/1/3/1/6/131637043/bopuwusunok.pdf
    • http://files.rpcrentals.com/uploads/1/3/0/7/130740547/9357424.pdf
    • http://files.travelswithatoddler.com/uploads/1/3/2/8/132814097/zaliwabelej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/mineniz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3031/files/heroku_push_master.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/32677088986.pdf
    • https://cdn.shopify.com/s/files/1/0433/8532/3683/files/ravebivo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/pharmacy_tech_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/dabigamifepaxuseti.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8727/files/50132162991.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/gofonapot.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/xubovabowuguj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/rebapizosofu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18491093394.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7504/files/36445956360.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/55671095544.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/pokagaxuxabibopofewop.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_off000075ef.bin
7e295a113fe5b7aab8a8fd8b86464146b340d82eb1da137abfd743066db8a3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EF 5208 bytes
font_01_sfnt_off00008791.bin
a32ddf27d76dd999530b6bf4546e9e3697c6784da7c5dc4a4304490fa564d2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8791 10300 bytes

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