Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8bbb5c98f84bab…

MALICIOUS

PDF

33.4 KB Created: 2020-08-23 05:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6ef78140de7c45c8e19949978d0b628 SHA-1: 1942d95fabcf6bec7d1cb03340723c3e021bf7ed SHA-256: ad8bbb5c98f84bab37d67ce98f4fb79166162b8b21830d5967635c1d7c296f81
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the 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.cc/pify?keyword=highway+476+traffic+report
    • http://files.drhusband.com/uploads/1/3/1/1/131163512/xesobemeju-dirip-lowukogamozi.pdf
    • http://files.architectinspect.com/uploads/1/3/1/4/131437161/kiwoxixivodap.pdf
    • http://sexusuber.tmharrisonphotography.com/uploads/1/3/1/3/131384600/josevowilogut.pdf
    • http://dosinibib.jeffersongalleries.com/uploads/1/3/1/4/131437987/2172493.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9109/files/xulaxosowojoselis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/food_safety_guidelines_fda.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/calendario_escolar_2020_20_sep_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1253/files/sheet_silicate_structure_definition.pdf
    • https://cdn.shopify.com/s/files/1/0445/3023/7599/files/rebajanaziz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/timibebewokidafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31240515614.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/kagan_structures_posters.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/95671620157.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/consumer_behavior_leon_schiffman.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/36974455267.pdf
    • https://cdn.shopify.com/s/files/1/0431/8045/8144/files/6526001577.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/adm_pro_6._4._0_crack_apk.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/1/0431

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000457a.bin
005098d10221813dffecbc231daf0ee4d761465a5959cda6dff158eac2fd04e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x457A 5544 bytes
font_01_sfnt_off00005879.bin
12cc03c65b6a1891b879b88dd219fd3d470a1775ab4c68380eaafd211734b952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5879 9400 bytes

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