Malicious PDF — malware analysis report

Static analysis result for SHA-256 90163a1315120f96…

MALICIOUS

PDF

52.0 KB Created: 2020-08-04 09:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 292c47c69e9ce1c6927c93fb7c8e0e3d SHA-1: e4a8a505764776edae1e4d1eca6639d515e0eb5d SHA-256: 90163a1315120f961a2274311b061f6096b81df2ad1a4478482132f583b75b6d
154 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.ru, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking and distribute malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or redirection attack.

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=sintesis+de+colorantes+azoicos+pdf
    • http://files.liswimming.com/uploads/1/3/0/7/130739348/mipogax-jasetavagimoj-difazelililuvo.pdf
    • http://files.thepulsefromcandi.com/uploads/1/3/0/8/130874369/vewojeragezuro.pdf
    • http://files.teach21too.us/uploads/1/3/1/3/131379296/6845531.pdf
    • https://cdn.shopify.com/s/files/1/0428/6896/5532/files/dakutiwibav.pdf
    • https://cdn.shopify.com/s/files/1/0433/8748/6358/files/social_zooarchaeology.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0432/0398/5570/files/75192059522.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/guvezanakevema.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/paris_metro_map_high_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/tokovasorigudumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9680/files/21899919058.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/totibapememoxox.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/57043547947.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/22834399388.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/4948066658.pdf
    • https://cdn.shopify.com/s/files/1/0438/5370/9472/files/62355667694.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007127.bin
a26d8225c428f84573b7a084c7fb4df79b11e8bc2c37150a845c243dfcbea75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7127 1948 bytes
font_01_sfnt_off00007a6d.bin
9da5f57ed9b8cd8ba31f7c774015c1ee41c8986cab0101764c38be173fe12953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6D 5088 bytes
font_02_sfnt_off00008bbd.bin
eb2cbcd827d460763b07ea2ab45ae4ecbecfbb6acb95ebea881e62869d84e71c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBD 12000 bytes
font_03_sfnt_off0000b239.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB239 4324 bytes

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