Malicious PDF — malware analysis report

Static analysis result for SHA-256 1648830372e71a22…

MALICIOUS

PDF

35.1 KB Created: 2020-08-07 07:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e22792acf510a658b70f1c474555132 SHA-1: 15f147a2418b437bdfb40489c6346f3f290ecf35 SHA-256: 1648830372e71a22f398008191fe1c81eea680bf8d113e922b5d220b0b37c198
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDFs hosted on Shopify, with one specific URL identified as a malicious redirector. This suggests a tactic to obscure the ultimate malicious destination and potentially leverage SEO techniques to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=pathway+bronkopneumonia+pada+anak+pdf
    • http://files.junglejoe.org/uploads/1/3/0/7/130738803/1984256.pdf
    • http://files.stephaniebershyoga.com/uploads/1/3/1/3/131379371/1049198.pdf
    • http://files.creswellclubhouse.org/uploads/1/3/1/4/131453194/zelutasuga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8847/8365/files/the_elements_of_programming_style.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/1231025824.pdf
    • https://cdn.shopify.com/s/files/1/0428/8793/8211/files/36512246981.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/tupixikijawidimi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/femepotufitaxaturu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7124/files/wegepinafajisabujuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/5620/9819/files/3161892953.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5094/files/76339283155.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/46677241254.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/viwurenewerukekirifat.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/94946784660.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/kefirek.pdf
    • https://cdn.shopify.com/s/files/1/0433/4426/5366/files/busaruf.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c0c.bin
2886afa8172e9b76cb8ae233040a14f3c185c56a91f900fe2834d6d54e0e04ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0C 5468 bytes
font_01_sfnt_off00005e90.bin
9ff896c1821db635a43ecb4814d020eb4ae5c83abf2ed366d95e6016f377344f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E90 9608 bytes