Malicious PDF — malware analysis report

Static analysis result for SHA-256 95944b77c0d2d36b…

MALICIOUS

PDF

34.7 KB Created: 2020-09-06 00:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9b79ef65e8ba17ce584b92dc582dfa SHA-1: 6cc3b75c8206ab292d9071ecb530e2d22a58a41d SHA-256: 95944b77c0d2d36bc9dcced909132cb72f5dc0088a33dd136a3a212a90e09e3e
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, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This indicates the primary purpose is to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct payload execution.

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.club/wix?keyword=chlorine+twenty+one+pilots+sheet+music
    • https://cdn.shopify.com/s/files/1/0440/8649/3349/files/cement_manufacturing_process_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0853/2380/files/math_logic_puzzles_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22893269325.pdf
    • https://cdn.shopify.com/s/files/1/0440/2066/2422/files/68881595762.pdf
    • https://static.usrfiles.com/ugd/18f527_0fc368adc14f436eb40dbb0a764fa1d5.pdf
    • https://static.usrfiles.com/ugd/7921d2_5b0aef4ac0b8433e8d12f8da7773fdcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_075b78366e3b4df1ba4a09d674a30a43.pdf
    • https://static.usrfiles.com/ugd/30e015_47dd01852ad54cbe88dc883286795b1a.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/42654589571.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/multiplying_radicals_with_different_index_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/32998623270.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/vmware_workstation_keymaker.pdf
    • https://cdn.shopify.com/s/files/1/0437/8119/3885/files/83846309224.pdf
    • https://static.usrfiles.com/ugd/8f6098_4068ea34232c4cf384a8d5af35a73421.pdf
    • https://static.usrfiles.com/ugd/d94ae5_006bdbbb86c34df9be2e16107719a6eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f47abcdb9904945a9c1c2bf44638d6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc0a1e00c05c47cbb3a4919759a81a06.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b39.bin
01dd384f0c92ad2d6438c61ad6e1d1ba5d668283ffa94da8da2264e92be0b09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B39 5064 bytes
font_01_sfnt_off00005c5e.bin
74ab28ce46c9e4887d4b4691911167db0f60878a4a3ab54b9a6b1620d13e49cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5E 9752 bytes

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