Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3854cb48f6db23f…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 09:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 221523ad69e94c37f4b06e963dbdcb25 SHA-1: 966165512c3b1f675c7d2022993507aafba19a62 SHA-256: b3854cb48f6db23f336204653a858abb8aaf137d2312ae7b4734fbdd048f0ab6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of numerous embedded URLs, including one pointing to a potentially malicious redirector, suggests this PDF is designed to lure users to malicious content.

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/wix?keyword=navajo+transitional+energy+company
    • https://cdn.shopify.com/s/files/1/0430/9755/5098/files/gb_whatsapp_app_apk_for_ios.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/zoxewinabenibamalefok.pdf
    • https://cdn.shopify.com/s/files/1/0436/8115/3177/files/blood_groups_diet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/nususozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/wajupekurol.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0558/files/83587795553.pdf
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/wojinudowarisutox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82127534182.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/72755515256.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/botokizipar.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/28602788427.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/66815385391.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/7486793596.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000627f.bin
a608e471e513e339a03dc7fc318cbe1fcc6c3b69e22a78f1be2e32ef4347be82
pdf-font-stream PDF embedded font (sfnt) at offset 0x627F 5248 bytes
font_01_sfnt_off0000745a.bin
8d7eeda8c14c65d1cd0e4569b2f3433b80dd31790cc53bea702a1315d177e15f
pdf-font-stream PDF embedded font (sfnt) at offset 0x745A 11908 bytes
font_02_sfnt_off00009b3e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3E 4324 bytes