Malicious PDF — malware analysis report

Static analysis result for SHA-256 b661075364e2b946…

MALICIOUS

PDF

36.0 KB Created: 2020-09-18 00:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a487735931714a93a8e167790a3b3a3 SHA-1: 84b442debfdfa072ff858824b6bd67746408e1ed SHA-256: b661075364e2b946bb03eaf809a7853d06ed7029a47f4bad7a0200ce031445ce
120 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, masquerading as academic content. One critical heuristic identified a malicious redirector link, and another flagged a link farm structure. The embedded document body, though heavily obfuscated, contains the primary malicious URL, suggesting the document's purpose is to drive traffic to potentially harmful sites. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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=intermediate+microeconomics+chapter+2+answers
    • http://jasovinip.nycmarket.net/uploads/1/3/1/4/131452861/widurizozugusonije.pdf
    • http://meraj.santoslawoffice.net/uploads/1/3/2/6/132682070/4016501.pdf
    • http://files.gfreegenius.com/uploads/1/3/1/3/131384583/f8e6b.pdf
    • http://files.thebackpackgirl.com/uploads/1/3/1/4/131438008/pinipikivuwe.pdf
    • https://246ccc03-98ab-4b2c-8e09-65ae38d12fbe.filesusr.com/ugd/28146e_66ae82055e1a43889be85b132bb83fda.pdf?index=true
    • https://161aec2d-bfbb-437b-b7ec-eee11cfafa1a.filesusr.com/ugd/eb2f7d_34e4dbb3e6d3465b96096549501141c8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/0679/4651/files/77678010873.pdf
    • https://cdn.shopify.com/s/files/1/0434/7156/9046/files/4859258229.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/aashiqui_movie_video_song_hd.pdf
    • https://d86de3e5-c080-4277-8a7d-4408300ff3b4.filesusr.com/ugd/5e8de6_f901a72bb0c44e58859e1e41d5e46769.pdf?index=true
    • https://8e3b05cd-65b0-4509-8603-99b1b047527d.filesusr.com/ugd/1cc7e8_78650689d0ae4488ba4ec40bbeb2c756.pdf?index=true
    • https://8b06befe-a94d-4d00-aed8-211e2f36e5a1.filesusr.com/ugd/07ef24_7b2360f67fc84f1eba482f592e49c0d1.pdf?index=true
    • https://e9f139f0-3443-4b5e-b0ef-18716ee11132.filesusr.com/ugd/0ebc1f_bc3f2340f0cb4189b92ceeba4271b069.pdf?index=true
    • https://dd42685e-429e-4ad7-9cba-c5702970fe38.filesusr.com/ugd/278743_b454727a4c78426e90aa6b2bfdc189f4.pdf?index=true
    • 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_off00004b06.bin
a4c8283914a6ea152dd8babeaa5486361b67b532cac62e95249446284e0fa083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B06 5444 bytes
font_01_sfnt_off00005d6f.bin
2a0ad03294b338e3c09fd1f0b89699a100443b90e65409e7c58e786f7833145d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6F 10284 bytes

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