Malicious PDF — malware analysis report

Static analysis result for SHA-256 856cb30524513e81…

MALICIOUS

PDF

41.8 KB Created: 2020-08-08 07:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddf766ed4be952af1ea2cd5eb6944c5f SHA-1: 0829f8d55886ec86bf610008fd2c1523f74327c0 SHA-256: 856cb30524513e8192a787a4fe0191a3125cac2c77d198397a8aeed0623891bd
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link, disguised as a 'keto cooking pdf', redirects to malicious infrastructure at ttraff.com. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to contain the malicious URL.

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=keto+cooking+pdf
    • http://files.sandrapeut.com/uploads/1/3/1/6/131606878/dae332b39a2c91e.pdf
    • http://files.the-witch-house.com/uploads/1/3/1/0/131069934/8830307.pdf
    • http://files.iananthonycoleman.com/uploads/1/3/0/7/130776718/9342694.pdf
    • http://files.ekhaonline.org/uploads/1/3/0/7/130738534/vajifisugadowol-kewijopuz-netiguwixa-vazedimujafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4944/1687/files/abbyy_transformer_12.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0572/files/acidos_organicos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/29883157087.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/84586219565.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/tatap.pdf
    • https://cdn.shopify.com/s/files/1/0454/3532/2526/files/abaqus_analysis_user_s_manual_6._14_vol_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/a_tube_catcher.pdf
    • https://cdn.shopify.com/s/files/1/0436/2171/2034/files/fleetwood_rv_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/98016474170.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/sarepapikejefaretu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/98707812411.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_off000065d2.bin
3aa99484bb9c5fe60c25b1eed3f0976a9771a57432dcd8048367f10a67bc8dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x65D2 4840 bytes
font_01_sfnt_off0000766f.bin
217a09a93a223e56165310e720d2aa022a70023d3b612a8612693be1bfbceddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x766F 10600 bytes