Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a2f3a5b96f47a3…

MALICIOUS

PDF

38.3 KB Created: 2020-08-30 09:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa07d51aceecaf0a32fa74bb031db6d SHA-1: 0d40b53f0ed89ad76ff3139bfe5ac5dc6a225dd3 SHA-256: 33a2f3a5b96f47a3bb01d6ecdcad701e1b827fdf07f6afe70404bffda16c0ea6
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the same malicious URL. This indicates a likely attempt to lure users to malicious infrastructure through a deceptive link farm.

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=battlefield+4+t%25C3%25BCrk%25C3%25A7e+yama+oyun%25C3%25A7eviri
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/98408171872.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/trx_functional_training.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/luxikemajibabopiliwemi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9499/files/94339370866.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/types_of_artificial_neural_network.pdf
    • https://static.usrfiles.com/ugd/451461_36d95db083bd49f8bf8af5243fc1071c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0f0038b036a46fb83fd4948d088a571.pdf
    • https://static.usrfiles.com/ugd/9d869b_9a6ebc04f9234606826698c21b446a5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2326bf082a4b47879fbc8d03a44528.pdf
    • https://static.usrfiles.com/ugd/8e1900_b717687f226a4e8d8d8ae32126693a36.pdf
    • https://static.usrfiles.com/ugd/33a2e4_eaca26b703ad40ed8daaf879390ffdce.pdf
    • https://static.usrfiles.com/ugd/b8c837_a307bbaee50b4c20bc0aacb279b4e8b8.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6599/files/addis_ababa_population.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9376/files/87077083734.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_off00005250.bin
505a7443e5285b8bf9161022229994a9390f40ef2af1cb1f5a6b65697d0ba38d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5250 5540 bytes
font_01_sfnt_off000064ef.bin
421e9b85d4431a8a05f0a2435f703e8312b10483ed1c65885dc38120e4467ed5
pdf-font-stream PDF embedded font (sfnt) at offset 0x64EF 12108 bytes