Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2566e1776666074…

MALICIOUS

PDF

45.7 KB Created: 2020-08-31 18:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de213dab9d2218bd8b61972e2fbca91 SHA-1: 81fde52325bc9e029b74578e84588cdba6b1ddf0 SHA-256: b2566e177666607415ebee59c47311edbb9d3d81988193dcf9dc360fed42c36a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a download for an Instagram analytics tool. The document body and embedded URLs reinforce this lure. The PDF also hosts a large number of links to other PDFs, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for 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/wix?keyword=followers+analytics+for+instagram+imetric+mod+apk
    • https://static.usrfiles.com/ugd/b8c837_da91eb6cea424e249b9b5cf871653045.pdf
    • https://static.usrfiles.com/ugd/ab059d_3c24b611cfe14815b7b7fc46f273f586.pdf
    • https://static.usrfiles.com/ugd/917232_be860dab9de040208071cac1c6752a3b.pdf
    • https://cdn.shopify.com/s/files/1/0431/7242/9980/files/systems_engineering_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/wamexumebiruxavuzowepu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/bodutowero.pdf
    • https://static.usrfiles.com/ugd/0b46e6_6a04b4bab1744cae863121fd98c50795.pdf
    • https://static.usrfiles.com/ugd/b8c837_1eb702da17994c0290abf58c1edf473f.pdf
    • https://static.usrfiles.com/ugd/b91566_a66838f0013b415e83c4f164ba9bd329.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/7241392843.pdf
    • https://cdn.shopify.com/s/files/1/0440/4733/5589/files/ca_ipcc_group_1_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/half_cocked_bad_reputation.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_off0000725f.bin
83fa9e73e1f028f5851cd1a2203228bf44a125b908c0554ed0a25aad28b3b7eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x725F 5688 bytes
font_01_sfnt_off000085c5.bin
d32562a98d358ca7baafb685aa1f5fe1fbf34f5b2479b2a992ae4c5afcf37eab
pdf-font-stream PDF embedded font (sfnt) at offset 0x85C5 10564 bytes