Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa5b2ab05b187aa…

MALICIOUS

PDF

46.0 KB Created: 2020-08-14 06:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b5f8299fa513036c855dce93cb7f47 SHA-1: 7aa026187e2e7dbc7215d93b4aea6dee0e5479b3 SHA-256: aaa5b2ab05b187aad16c132af380aac9b87a3801457472e278df478675ffa84b
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one heuristic specifically identifying a link to known malicious redirector infrastructure. Another heuristic indicates a large PDF link farm, suggesting a potential SEO manipulation or content hosting strategy. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely serve as lures or redirects to malicious content.

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=bwakila+new+comedy
    • http://wuneva.andrewjkeir.net/uploads/1/3/0/8/130814729/tomupopomofipirisi.pdf
    • http://files.atkinsonbrassco.com/uploads/1/3/1/1/131164199/pamuzojar.pdf
    • http://mokulunol.blue-sky-coach.com/uploads/1/3/2/6/132695818/9817270.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/13560638105.pdf
    • https://cdn.shopify.com/s/files/1/0435/9510/4424/files/zebiraroxinal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8511/1203/files/74359196417.pdf
    • https://cdn.shopify.com/s/files/1/0434/7114/3078/files/73840039094.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4751/files/44508197380.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/brm_projects.pdf
    • https://cdn.shopify.com/s/files/1/0448/0227/7542/files/43099157713.pdf
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/21820948161.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/the_great_gatsby_anticipation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/5111/4908/files/causas_de_anemia_normocitica_normocromica.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_off000077bb.bin
6d007242411941aeeac7dcffdd93ac156ff20e130f73672ed008a8c583145762
pdf-font-stream PDF embedded font (sfnt) at offset 0x77BB 5120 bytes
font_01_sfnt_off00008927.bin
3c7e591d9fe20e372afd308d6fdfcc4171fa191324f1a018329cf99995a2b6bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8927 10060 bytes