Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cac325a91fe01c…

MALICIOUS

PDF

43.4 KB Created: 2020-08-09 20:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f968624d236b1ec9fbac2a75fa952a4b SHA-1: e0f9d8fbe8a13369999a84deed21b8de63e1cfc3 SHA-256: 98cac325a91fe01c69e08cd210e65a9f1f0469c7c0ddcf1bdbcbb8aa3d41458b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but also includes a critical link to a known malicious redirector at `ttraff.cc`. This suggests a tactic to manipulate search engine results or distribute malware through a link farm. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=questions+and+answers+on+alkanes+and+alkenes+pdf
    • http://files.zenitude-uk.com/uploads/1/3/0/8/130813054/7426879.pdf
    • http://files.belllog.org/uploads/1/3/0/7/130775827/2358242.pdf
    • http://ranul.miketaylorphotoarts.com/uploads/1/3/2/3/132303382/96da6d13d.pdf
    • https://cdn.shopify.com/s/files/1/0437/3718/6453/files/29255944102.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19463184481.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/gesufugowapusitasoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6338597663.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/mafaxama.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0309/files/98989339241.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4789/files/9579995051.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gekubamunanapomokavonata.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/78195975350.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/riff_raff_instagram.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/definition_of_applied_social_sciences.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005db0.bin
4e38696c3e3e8ce406e189b0e6f85b96f66a42f87438e89c86aca3bf7da2000d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB0 5136 bytes
font_01_sfnt_off00006f44.bin
9df1287d9c4460423e52c0b308e7335d309db1294d47c2b6d9f5d16bb2729e9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F44 10084 bytes
font_02_sfnt_off000091c2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x91C2 4324 bytes