Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7ee243dc25374a…

MALICIOUS

PDF

69.1 KB Created: 2020-09-01 05:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90bb430a527a635d8e91a380adc62cc6 SHA-1: 1c0becdb93ae69328a2c4a97a968ca5937325a56 SHA-256: 0b7ee243dc25374a06131da09e91ae23a5aa8d421bb63d303da5f21f94f5423a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure victims to malicious sites, potentially for phishing or malware distribution.

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/wix?keyword=bootstrap+3+icons
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0464/3219/0616/files/job_application_letter_format_in_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/vokitilok.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/houghton_mifflin_harcourt_english_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/nemexe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/dixiwuto.pdf
    • https://static.usrfiles.com/ugd/d78803_eecf0034173a4b959fccee773eef18ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_c92885005f1e4e63921941a4326e60d0.pdf
    • https://static.usrfiles.com/ugd/0df15e_4e3e6e7f90894c189a1e6369dc2d1534.pdf
    • https://static.usrfiles.com/ugd/b6edda_41a5e3dee20844a5a9ca19795a8d36bb.pdf
    • https://static.usrfiles.com/ugd/3e9e83_ac2b84f344294204b0dbba247882464d.pdf
    • https://static.usrfiles.com/ugd/0c4177_56c8439370484f25b6678628189e31b9.pdf
    • https://static.usrfiles.com/ugd/6908d7_08f479c01b9a496384bee7f7dc7ed1c1.pdf
    • https://static.usrfiles.com/ugd/c5d40f_64f5374b75ef4a7494dce0d08628089e.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/zuwolabifubuwozojotugavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6818/files/tojovibew.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_off0000b3dc.bin
78ed56ca928c52dc4634d02ce7c3a862e3b333589b8bedbd15b74dfa6995a30e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 4776 bytes
font_01_sfnt_off0000c413.bin
3b655119504cabcb2750d7eb3ddec14e35e8f5f39cf1351f88c90b69b86ffacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC413 16708 bytes
font_02_sfnt_off0000f7da.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 4324 bytes

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