Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb1ac0193b0206f…

MALICIOUS

PDF

38.6 KB Created: 2020-08-21 00:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f20e9a2c75022d3f21e4630ca497bd9 SHA-1: 41268865425b0062e4ec8dbe6608f7551e00957b SHA-256: dfb1ac0193b0206f45518a843b5e67199f9e9321b49e1854ddbc67a00f43c25a
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body also explicitly contains the URL for the redirector, which is designed to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous other links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to disguise the malicious redirector.

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.com/pify?keyword=java+jdk+1.+8.+0_181++archive
    • http://lexovu.cornerstoneteen.org/uploads/1/3/2/8/132816036/febari-zititiwejumot-melikoragijifod.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7505/files/don_giovanni_overture.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29942388251.pdf
    • https://cdn.shopify.com/s/files/1/0437/1474/0373/files/79209753136.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/17375443580.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/probenecid_davis.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/81979433934.pdf
    • https://cdn.shopify.com/s/files/1/0448/1895/6448/files/army_sworn_statement.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/vibusenoridizukopodokiwab.pdf
    • https://cdn.shopify.com/s/files/1/0463/4551/9261/files/bcbs_fl_medical_policy_guidelines.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_off0000568e.bin
5bc48e2e482ba51750972983b8432c2de38aabe81753814dd09058007f3bdfde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568E 5456 bytes
font_01_sfnt_off0000692f.bin
053eb9d1c914bda57e4aa652d5ed56126580543a448c799f70fb882d4c8ea9a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692F 10328 bytes

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