Malicious PDF — malware analysis report

Static analysis result for SHA-256 2313a48fbe0e649e…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 01:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c82d8b2592e973fbab1f6908441e0af8 SHA-1: 8e7d63ca109cf06892f401f3beb50711ce728f47 SHA-256: 2313a48fbe0e649e36996764432e86b099f72131d8db9130361b380798db2e2b
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.cc/wix?keyword=monitor+audio+bronze+5+review', points to a known malicious redirector. The PDF also functions as a link farm, with many links pointing to Shopify domains, suggesting an attempt to manipulate search engine results or distribute spam content. No scripts were extracted, and the document body is largely unreadable binary data.

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.cc/wix?keyword=monitor+audio+bronze+5+review
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/sims_4_cc_beards.pdf
    • https://cdn.shopify.com/s/files/1/0450/6884/5208/files/fafotuzaselitibole.pdf
    • https://cdn.shopify.com/s/files/1/0436/9373/6089/files/55926888781.pdf
    • https://cdn.shopify.com/s/files/1/0434/9001/7430/files/14346266507.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/19504414533.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8701/files/chemical_reactions_and_equations_mcq_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/7140/5222/files/23274614281.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/galebijapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2187/files/pukimejixowet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/69028222244.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/zomexijogo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1917/3029/files/trois_petit_chat_chanson.pdf
    • https://static.usrfiles.com/ugd/dc98cc_a121426118d54365a0d2e4124eb1d024.pdf
    • https://static.usrfiles.com/ugd/22bf55_d18ef7f2985440f4a5abfc9e1729f160.pdf
    • https://static.usrfiles.com/ugd/b8c837_438e1362bc0744e18a14f7939ea4c637.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_off000067a6.bin
977d21108a5530c100a76650d111bb8ab056934c3a5edeaa6973cd7d19c5a41c
pdf-font-stream PDF embedded font (sfnt) at offset 0x67A6 5080 bytes
font_01_sfnt_off0000791d.bin
e068ee3b0d31ee48de9064483c9e2fd7fcd5dc3ef23201cc5281660eb61b6804
pdf-font-stream PDF embedded font (sfnt) at offset 0x791D 9892 bytes