Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f03e3978bf4ecdc…

MALICIOUS

PDF

46.7 KB Created: 2020-07-27 19:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0febc07d699299e793bb5016102b01ef SHA-1: 86c17bf49e3453b296d672c3dcdfc1299ebce0a3 SHA-256: 7f03e3978bf4ecdc070531901d55eacd925390c2e3aebebd6e7502c87b5a70e3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm with numerous external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains metadata related to 'wkhtmltopdf', but the primary malicious activity is driven by the embedded malicious URL.

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=blur+image+background+app+for+android
    • http://files.remnantsofmagic.com/uploads/1/3/1/4/131453399/jabodaxu.pdf
    • http://files.profpaulgilbert.co.uk/uploads/1/3/2/7/132740533/7225939.pdf
    • http://files.oldmapsofthe1800s.com/uploads/1/3/1/4/131411596/nejegufojiwipu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2518/files/43273125431.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/28684754849.pdf
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/dazuzejopasumulubenet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/49097046232.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/rudafetoteruzikasilibezuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2266/4348/files/venasawuluz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/podalaledimanuser.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/vowibovifotonaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/rafaredibupaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1303/6439/files/69481048659.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/pakuxudese.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/44109438605.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/
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/dazuzejopasumulubene

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007541.bin
a0bba9974d63eaabdf10dbd5084084e94f69459fa9e5342bae0191d1a5dac14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7541 5352 bytes
font_01_sfnt_off0000874e.bin
5883d8b1e6d4a7ef6dbbb255829269af7ddc4e5b4f90a3a22a44612fc3f81903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x874E 11496 bytes

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