Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0a28b5382508c8…

MALICIOUS

PDF

44.8 KB Created: 2020-07-31 04:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f20fcbb74c42db008d64abd25c5d7a6 SHA-1: c70c02be012bd18f357cf9e0a1032aebfbf24251 SHA-256: ac0a28b5382508c8721d4f13797d2eec3072d6f1f333a52d0dc4d5c147008a17
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded URLs, many of which point to a redirector service (ttraff.com). This suggests a link farm or SEO spam campaign designed to drive traffic to potentially malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery.

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=periodic+table+with+names+pdf
    • http://files.denverbap.com/uploads/1/3/0/7/130739806/5399404.pdf
    • http://files.capitalaccesshk.com/uploads/1/3/0/7/130775424/kidulutevoxenow_difavinijitozo_gizavufaxo.pdf
    • http://files.absolutepartydjs.com/uploads/1/3/0/8/130874394/4c5a51f48b20.pdf
    • http://files.pilgrimchurchspokane.org/uploads/1/3/1/4/131454620/0cd15bf.pdf
    • http://files.the-westwood-wire.info/uploads/1/3/0/7/130738779/vamexasate-leteruxid.pdf
    • http://files.the-westwood-wire.info/uploads/1/3/0/7/13073877
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/85376098821.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7055/files/59812750012.pdf
    • https://cdn.shopify.com/s/files/1/0432/3655/6962/files/25853416076.pdf
    • https://cdn.shopify.com/s/files/1/0440/4841/6933/files/tatuxelakumona.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/mufoji.pdf
    • https://cdn.shopify.com/s/files/1/0439/4418/1928/files/17968424950.pdf
    • https://cdn.shopify.com/s/files/1/0431/5126/1853/files/44015932843.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/fibovapevese.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/favijuze.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_off00007242.bin
802de24df8769a5f08fecea751c2631e038d303faa91917fdc13385a8a1abcd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7242 5416 bytes
font_01_sfnt_off00008476.bin
e91ba6b40b907baca8eedb43d2db23f1fab46393ec3ae1ff3ba429ef5349d167
pdf-font-stream PDF embedded font (sfnt) at offset 0x8476 9860 bytes