Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcff490874a21946…

MALICIOUS

PDF

38.5 KB Created: 2020-08-19 22:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcededece218d35ce41ec2672497dcbf SHA-1: 4f7426ab72e5db88c063191d644667d37b8fd6fe SHA-256: bcff490874a21946b6a0f00a6f07f678d50bf327ab4aa4965f7bde808baf8ac1
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a large link farm. The ML classifier also strongly indicated maliciousness. The embedded links, including one to 'ttraff.ru', suggest a redirection or SEO manipulation scheme. While no scripts were extracted, the sheer volume of external links points to a malicious intent, likely to drive traffic to malicious sites or for SEO poisoning.

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.ru/pify?keyword=html+format+text+color
    • http://files.beardedmaverick.com/uploads/1/3/0/7/130739043/fosutetos-rokedosuj.pdf
    • http://files.quincyconference.com/uploads/1/3/1/8/131871864/3625457.pdf
    • https://cdn.shopify.com/s/files/1/0431/9130/4343/files/php_simple_file_upload.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/52118301439.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3795/files/93115392006.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/91365229065.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9571/files/47857142018.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/vukarukulo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/31170275461.pdf
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/58322063524.pdf
    • https://cdn.shopify.com/s/files/1/0428/7873/0403/files/finamaxikulefolerokefiloj.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_off000050b1.bin
e9456353f68486ec2f6d19cc574efec1580d2615226d449e7e008604cfe71a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B1 4876 bytes
font_01_sfnt_off0000612f.bin
2a409df8cc3911e73c7e389cdc9787b616a83e54b325089e889bd7883b742f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612F 13848 bytes

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