Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6b9112276659ca…

MALICIOUS

PDF

51.8 KB Created: 2020-08-18 16:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f385ee53560f6ca7cb655cc2c5bde310 SHA-1: 77188d3d1dd47a62260a0dc38cd339729bf5c588 SHA-256: ab6b9112276659cacb58dc6f304e2cfddd87a70e6ff87cff9d6712e4074db054
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a PDF link to a known malicious redirector infrastructure at 'ttraff.com'. Additionally, a large number of links point to PDF files hosted on Shopify, indicating a link farm strategy. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern appears to be SEO manipulation and potentially redirecting users to malicious sites.

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=renal+lithiasis+guidelines
    • http://files.jeffkirchoff.com/uploads/1/3/0/9/130969772/zovixomejuwujo.pdf
    • http://files.rivalme.org/uploads/1/3/0/7/130776218/fesegerotinex-moxibajurizol-jasisi-sutotexapu.pdf
    • http://fasavupu.ladse.org/uploads/1/3/0/7/130776485/xamezi_lobufedatatagot_sukofafikono.pdf
    • http://files.pjmknives.com/uploads/1/3/2/6/132695354/fidobiz-guvorufate.pdf
    • http://files.originalsexyslave.com/uploads/1/3/0/9/130969004/ca2abe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7331/5740/files/64156778616.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/76064011972.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/articulatory_phonetics_bryan_gick.pdf
    • https://cdn.shopify.com/s/files/1/0434/2546/4476/files/90353514009.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24370467333.pdf
    • https://cdn.shopify.com/s/files/1/0446/9365/1610/files/calculus_and_analytic_geometry_by_talpur_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5976/files/cisco_2960_ios_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/sodufusigulebisafiku.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_off00008d78.bin
f7d8008f2f030c437b764f2e4e17072de154732f6b6dd744e0aa7ebe56dae703
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D78 5000 bytes
font_01_sfnt_off00009e71.bin
e140c988cbe27c6eeec3377a46e67632a3961dcd18a4b20ee5c7259f58583d30
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E71 10548 bytes