Malicious PDF — malware analysis report

Static analysis result for SHA-256 67779bef2cd0a9a0…

MALICIOUS

PDF

60.8 KB Created: 2020-07-31 02:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc50c29c7b05ce8c59d3021996b6b518 SHA-1: b823c6d1dfb17d6ed6c84b98791bed1cce827abe SHA-256: 67779bef2cd0a9a0093eca8bd1c6e5a828800643dfc989f3f7193c9485793991
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 heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. 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.ru/pify?keyword=antigeno+prostatico+total+y+libre+pdf
    • http://files.sherieunfiltered.com/uploads/1/3/1/0/131070289/puxunuxoxom.pdf
    • http://files.fixmyscrubber.com/uploads/1/3/2/6/132681855/lanafoz.pdf
    • http://files.ocvbc.com/uploads/1/3/0/9/130969603/voborubinaboputiva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/31157339784.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/59484987809.pdf
    • https://cdn.shopify.com/s/files/1/0433/2103/2859/files/loruvuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2225/files/zunokedigesiputifoxa.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/jovejololarireb.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/33872622963.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/gipefubidupajologe.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/12953208424.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0447/files/ledutazoxojatekunup.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/fezesogesilukadofabimanu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/88068134720.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/70576202936.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_off0000aaf0.bin
51a2f8c53be448ea299186040403e3b555caae70f818bab2d7e75dd2e63978eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF0 5340 bytes
font_01_sfnt_off0000bd27.bin
c620c6139ebf17935c41d69676b651c9ae24e1e0693623e95c846faefeef2190
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD27 11908 bytes