Malicious PDF — malware analysis report

Static analysis result for SHA-256 4185c2931eaf697c…

MALICIOUS

PDF

41.0 KB Created: 2020-08-29 01:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154e288814e253f24c96332d25b986c4 SHA-1: 75d7aa35cf31e69aa307d857b93c95c98b3fb064 SHA-256: 4185c2931eaf697c87aa6f2ffbfbdb7fe8ab3ff2e8781a0a822fef2fbb341a8a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a link to an academic publication. This suggests a phishing or malware delivery attempt. The PDF also contains a large number of links to various Shopify-hosted PDFs, likely an attempt to manipulate search engine results for SEO poisoning. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly indicate malicious intent.

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/wix?keyword=the+science+of+psychology+3rd+edition
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/3145526245.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/guia_alimentaria_de_guatemala.pdf
    • https://cdn.shopify.com/s/files/1/0438/7697/4747/files/canon_700d_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suxuteregejo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/73490890676.pdf
    • https://cdn.shopify.com/s/files/1/0432/4891/0498/files/50982969306.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalajenoderemomepofelefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6935/7728/files/76118837869.pdf
    • https://cdn.shopify.com/s/files/1/0430/9994/7162/files/ankush_name_status_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/reloading_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5350/6969/files/device_id_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/59886731392.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_off000062ff.bin
7419d2e07c8abe2147ebf80577ac2abcff906e2d4e052c911a69c35dc388cb91
pdf-font-stream PDF embedded font (sfnt) at offset 0x62FF 5420 bytes
font_01_sfnt_off0000756c.bin
37ae74bdb62e442d24a6a77b0e0a322f0eb432e95430dc1ce41e1e46d2b1a4f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x756C 10040 bytes