Malicious PDF — malware analysis report

Static analysis result for SHA-256 167c7da510ccfa0e…

MALICIOUS

PDF

43.4 KB Created: 2020-08-17 05:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bca5794d7b747be1531e5c8fb2d6208 SHA-1: 3ee19635314b196e830f7627d6f157190e7f44a8 SHA-256: 167c7da510ccfa0e0b290363deb183a6a14992f88d412b253e9ea66963c3e34a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URL fragments that suggest a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to malicious 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.com/pify?keyword=assembl%25C3%25A9e+nationale+rdc+pdf
    • http://files.troyfoundation.org/uploads/1/3/1/6/131606128/5546008.pdf
    • http://files.fundep.org/uploads/1/3/0/8/130874278/sotulen.pdf
    • http://files.bolingbroke-writers.org/uploads/1/3/0/9/130969663/wetaxola.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/vumeluni.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/how_to_make_a_favicon.pdf
    • https://cdn.shopify.com/s/files/1/0434/1307/8168/files/volalej.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/gejipifakovudususemel.pdf
    • https://cdn.shopify.com/s/files/1/0437/9728/2977/files/gofuruwopigunazoxetiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/6704472676.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/leech_lake_fishing_report_mn.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.pdf
    • https://cdn.shopify.com/s/files/1/0437/7640/9751/files/wedding_march_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005918.bin
bf62e31b22d1eb5c49ca5f985d6e471fd7a046fb4f94a7f3066e4209d5032b62
pdf-font-stream PDF embedded font (sfnt) at offset 0x5918 5360 bytes
font_01_sfnt_off00006ae1.bin
cbb5fc3688f2e1d18175f8044aee9250c096f0ff847ddad6a783da3fcbdb2636
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE1 12056 bytes
font_02_sfnt_off000090f5.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x90F5 4324 bytes