Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92c5041f38ae5f5…

MALICIOUS

PDF

47.9 KB Created: 2020-08-15 13:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee8407bc2c6f45c2dc9cd7c176f94ab3 SHA-1: 4df5a546c66bd7ef3c09007e1f17bde278621166 SHA-256: d92c5041f38ae5f570e862bc41eab778fdfeb7205da7e703fbefe86e399ce1eb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to benign Shopify domains, but also includes a critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wb?keyword=wendy's%20nutrition%20guide%20canada%20pdf', suggesting a lure to a malicious site disguised as a nutrition guide. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=wendy
    • http://files.brooklynacademyhs.org/uploads/1/3/1/1/131164351/pizav_kevejivarete_wedumikisesug_daliwozow.pdf
    • http://files.unhbeelab.com/uploads/1/3/0/7/130740141/xexomuzoresaroluluja.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/platform_1993_full_movie_filmywap.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5144/files/keninomajogijiso.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/petty_cash_book_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/remoxofapebejisub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3512/2081/files/4347061260.pdf
    • https://cdn.shopify.com/s/files/1/0435/5063/8229/files/jonathan_haidt_righteous_mind.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/neoclassicism_and_romanticism.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/18659979570.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/21761523648.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_off00006077.bin
78111989be81304b1fc9fa9f634eafec27bad17374c6a2533e4fa4953d9b4c5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6077 5320 bytes
font_01_sfnt_off000072bb.bin
923a3ca1b1bc7a0cbcd85488d148534c959730a43f4ff4f20ee1728e74ed868e
pdf-font-stream PDF embedded font (sfnt) at offset 0x72BB 16076 bytes
font_02_sfnt_off0000a51c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xA51C 4324 bytes