Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80ce881e16c8138…

MALICIOUS

PDF

70.9 KB Created: 2020-08-29 04:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbf140910a6bf5d3becfa94dd6619b27 SHA-1: 7e3b1d7f3179d09fff6613902cdea7eae70ce694 SHA-256: e80ce881e16c8138534422aa46fe8f0480891cb10bfd9a0535077053cb811dc4
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'The ranger's apprentice book 1 pdf' and the wkhtmltopdf tool, suggesting a lure to download or access malicious content disguised as a book. 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/wix?keyword=the+ranger%2527+s+apprentice+book+1+pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/smiologie_radiologique_de_l_appareil_urinaire.pdf
    • https://cdn.shopify.com/s/files/1/0433/0641/8331/files/upcoming_bank_exams_2020_20_full_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/2784/7576/files/mahiki_drinks_menu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/muviwolupitulokolaza.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4c0239534bb4abcb72b5598d5bb5b29.pdf
    • https://static.usrfiles.com/ugd/b8c837_96a059437a0649ac9aaf8f377b63c9d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f8343cff1d749209f13e85b872057f1.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8391/files/24048955878.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/toxagawew.pdf
    • https://cdn.shopify.com/s/files/1/0436/5628/2265/files/75706628790.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4791/files/74371372595.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/17738747527.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/41499790550.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/case_study_house_21.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_off0000c9f7.bin
7ee16324205296dd4485d80c507ec75df32fa95be1c7e7b1ad1b11821deb0650		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 5412 bytes
font_01_sfnt_off0000dc53.bin
4b8b3cfe4535cbfaeff30e45b61e18296607541c425341336ac3821519c355b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 10516 bytes
font_02_sfnt_off00010004.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 4324 bytes

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