Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f4841a61d5acb9…

MALICIOUS

PDF

44.9 KB Created: 2020-07-31 08:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a34e6d60100e135b2b6baf1eeff5a81 SHA-1: 27b9fdac18c6168f8610fb2a4082c9342efe659a SHA-256: b7f4841a61d5acb9ec13b2498c71ce1928e226cbac1ec65313d9349a99a72ce2
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'English short stories for beginners pdf'. The presence of a link farm further supports the malicious intent of directing users to potentially harmful sites.

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.ru/pify?keyword=english+short+stories+for+beginners+pdf
    • http://files.itmspeakers.com/uploads/1/3/0/8/130813095/dbc2e57a.pdf
    • http://files.templeenterprises.com/uploads/1/3/2/8/132815206/1aed9775250.pdf
    • http://files.abesoutfitters.com/uploads/1/3/0/7/130775537/rozezimigatam.pdf
    • http://files.thepigmentgroup.com/uploads/1/3/1/3/131382243/336a8f2.pdf
    • http://files.glassfenceusa.com/uploads/1/3/1/3/131381067/keridube-gibudovunutimo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/50017999009.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/woxesixifi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5387/files/25042553545.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/99428935038.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/xobisevevenaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/69941755496.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/73888190168.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/998890772.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/gijumevugidarunotowivo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/54384771292.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/968342683.pdf
    • https://cdn.shopify.com/s/files/1/0430/3706/5370/files/bipevusunovixaderotiwevax.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9690/files/pupuloluduv.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_off00007332.bin
b2eca7ca07dbb0e73e8093afbdb21bb09245d418791fe502d4b9214ea88460ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x7332 4976 bytes
font_01_sfnt_off0000840a.bin
74734cb04cdab31c1f8480c59ddd4e40ada7f033dfd0e65a873cd5c938901368
pdf-font-stream PDF embedded font (sfnt) at offset 0x840A 9976 bytes