Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a693e4c60a2133…

MALICIOUS

PDF

41.0 KB Created: 2020-08-19 11:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e99cf7497da3425fda185b3a327c8266 SHA-1: eabe8e2f4e6ba42f3fcd56317729ccf9501b234c SHA-256: 62a693e4c60a213367592c0308ff99a60bea8d614d536dd389fc74d65862d9e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute further 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=jinja+template+outer+loop+index
    • http://legiv.exclamationservicesusa.com/uploads/1/3/2/7/132741198/a210a1283b6.pdf
    • http://meveje.gilipalms.com/uploads/1/3/0/7/130739963/1a3cd5680679.pdf
    • http://davewoju.sctaci.com/uploads/1/3/1/4/131454065/2d2dfbb1ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/wubixorot.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/nimunilavapemajazavinil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9792/files/classification_of_anti_tuberculosis_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0449/5494/3643/files/chinese_cuisine_menu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8538/0246/files/86389384863.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kusamusa.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/33050749862.pdf
    • https://cdn.shopify.com/s/files/1/0428/0346/2303/files/60853528080.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_off000062e4.bin
886a5b8f0162838fb6809a579963829f1e7f3bd780cf61e1ff648ec0a35f9dee
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E4 5060 bytes
font_01_sfnt_off00007403.bin
a2ee3ad2701e8acfc154612bf2190345b5b63ebe569b29aa747f17fccf14e68b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7403 10344 bytes