Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1ba51a7dac0841…

MALICIOUS

PDF

121.0 KB Created: 2020-09-12 06:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ff7933d1d8ffdaead0cfac04a1346f SHA-1: ef1ba0d5d75d11099be7357e9bc9669eb8707e8f SHA-256: 9e1ba51a7dac08415ee827d761c380979707489b035d7a7c149d68f6ab5f5657
152 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm. The embedded URL 'https://ttraff.club/wix?keyword=lord+byron+biography+pdf' is directly linked to a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. 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.club/wix?keyword=lord+byron+biography+pdf
    • http://gigewade.bostonhelicopters.com/uploads/1/3/1/8/131855981/5ccc786c929.pdf
    • http://files.devinjamesbaldwin.com/uploads/1/3/1/8/131871555/duzavewuxizuku_gafejasotiw_nudup_laravus.pdf
    • http://files.mrtaylorsbandroomatgtacs.net/uploads/1/3/1/4/131438137/3238878.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/36351348788.pdf
    • https://cdn.shopify.com/s/files/1/0466/2794/6661/files/drools_guided_rule_editor_eclipse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikoleluvotejagumali.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/rutuzuguzewamoxavejedaken.pdf
    • https://cdn.shopify.com/s/files/1/0437/9043/4455/files/car_title_transfer_form_louisiana.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/android_emulator_mac_react_native.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/10463197660.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/xamupalatukogalaxomulav.pdf
    • https://cdn.shopify.com/s/files/1/0464/7957/3160/files/south_africa_hip_hop_songs_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/kaputegatoreramun.pdf
    • https://cdn.shopify.com/s/files/1/0447/7186/8821/files/momoturenevavuwixobatukel.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_off00017e75.bin
d6a7835ec86b8901a7b7ec4a6950714c76b9a3f962ed231aeb6fa17363199c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E75 5276 bytes
font_01_sfnt_off0001906f.bin
24505a2a54303a115e388736b590e958a44a06acd72a33ba04b8b5e82cde16dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1906F 12816 bytes
font_02_sfnt_off0001ba19.bin
e57392327aef911034e9db881ed1a8451fb50e7e70110c544b2fdf6a81d4a181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA19 17816 bytes

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