Malicious PDF — malware analysis report

Static analysis result for SHA-256 d920f8b7811afedb…

MALICIOUS

PDF

43.4 KB Created: 2020-08-07 19:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d58e4987f4156daf58c26df09ac54dfe SHA-1: 34dfd288c60a9a639eb9524deef21d17cc7c57b1 SHA-256: d920f8b7811afedbbad3d137e64e8eb04c47ee4e8e77f1fa80ff111ca3dca575
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=atmega16+datasheet+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC+pdf'. The document body itself is heavily obfuscated but contains this same URL, suggesting it is the primary lure. The presence of numerous other links, many hosted on Shopify, indicates a link farm designed to distribute the malicious payload.

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=atmega16+datasheet+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC+pdf
    • http://files.oksportscombine.com/uploads/1/3/0/7/130776245/6e6f6681.pdf
    • http://files.ameridragonsports.com/uploads/1/3/1/0/131070938/76089.pdf
    • http://files.richardsavenuebusinesspark.com/uploads/1/3/0/7/130738794/5df5b8487ca93b.pdf
    • http://files.perspectate.com/uploads/1/3/1/3/131384171/ruwabupojazewu-zaxemazus-zutoxin-vemutiwevabuxu.pdf
    • http://files.tribute-kadeykrogen39.com/uploads/1/3/1/3/131398455/1acb706.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/84753294428.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/13417751769.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/renosutasavixenoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/nazenogozewema.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/aromaticity_rules.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/36952560734.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/nenanobitoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9265/files/87644342742.pdf
    • https://cdn.shopify.com/s/files/1/0431/3556/5978/files/weight_of_love_tab.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/dfa_passport_application_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/aaron_lewis_country_boy_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/zipuvimepoworo.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_off000059d9.bin
94faa769658e80ff0a8f927d62c42f963ed230a2ca43c713db7d60107aad2678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D9 6424 bytes
font_01_sfnt_off00006e6a.bin
3bcc4a409f152c2d4c8be33d1b13aa53f10c373503411c8264e9bf11725ba0cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6A 15352 bytes

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