Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b20f977ef0bf47…

MALICIOUS

PDF

45.6 KB Created: 2020-08-02 18:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3ec95de2eb5b0a0edfd91feafefab5d SHA-1: 6d55b6140c72fe92c74f4bcbf405f084d16f2079 SHA-256: a6b20f977ef0bf47642a5f280dc5dd2f169db6ef297bc054e18c70d0f7f1103d
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links points to a known malicious redirector, while others form a link farm hosted on Shopify. The document body contains garbled text but also includes the malicious redirector URL and several Shopify URLs, suggesting an attempt to lure users to external content. No scripts were extracted, but the sheer volume of links and the critical heuristic firings indicate a malicious intent, likely for traffic redirection or SEO abuse.

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=akai+xr20+tutorial
    • http://files.euphonymagazine.org/uploads/1/3/2/6/132695569/c60d12f.pdf
    • http://files.dgassoc.net/uploads/1/3/1/1/131164452/7151466.pdf
    • http://files.carlisleconcernedcitizens.org/uploads/1/3/1/6/131606490/toviwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/79305905510.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/6272470747.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/pamoxitezopikojenunizit.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/rasojimubusumapimaxino.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/bimawu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/15892949291.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/fobir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0742/files/for_loop_bash.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/mudeta.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/21147180012.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_off000076bf.bin
db57120be0b57115658b5a4de27feeafd545f37f1c26fa4a56d7c398d04831ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x76BF 4896 bytes
font_01_sfnt_off0000877c.bin
dbb831a41f0c18ee531294f6e400dc32c00893d5109465a4b89a0e9a95b041f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x877C 10100 bytes