Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fe6a37b8948023…

MALICIOUS

PDF

43.7 KB Created: 2020-07-26 00:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e30bd3ba309304ac3e8a1c8773aecf8 SHA-1: 20be09dd4a19b9f2996a8b72ec049911a63f9274 SHA-256: d7fe6a37b8948023181b251a54e0e3f362f3b8097f571320a363937d90955ed1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to ttraff.com, and PDF_SEO_LINK_FARM, indicating a mass of external PDF links. The ML classifier also strongly flagged this PDF as malicious. These findings suggest the document's primary purpose is to redirect users to potentially harmful sites, likely as part of a link farm or SEO abuse scheme.

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=biochemistry+questions+pdf
    • http://files.wendybrockman.com/uploads/1/3/1/1/131164462/sonaw.pdf
    • http://files.chittendenpreventionnetwork.com/uploads/1/3/1/3/131382982/jodivuxedo.pdf
    • http://files.ontmoetpalestina.nl/uploads/1/3/2/6/132695470/3958713.pdf
    • http://files.gnteachers.net/uploads/1/3/2/7/132710669/7faa63be.pdf
    • http://files.warehousechurch.org/uploads/1/3/0/9/130969129/786e29.pdf
    • http://files.war
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/40006964266.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/84535799503.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/83387592981.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/fagipiganinusiragovolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3339/5353/files/7256606033.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kofuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/bawiwolun.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/pixuxoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3887/files/mezolap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/gesabijo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/xorefumonoveken.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/megovenudilusubum.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_off00007062.bin
61270eb3b00303a2467a1b6886e23da25b46318fb228da2aced21233ad6d9209
pdf-font-stream PDF embedded font (sfnt) at offset 0x7062 5312 bytes
font_01_sfnt_off00008245.bin
aad23cb5ffe072b9153fd2d93e399d251a6b86b77117ea2f4927d6c632ec95f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8245 9324 bytes