Malicious PDF — malware analysis report

Static analysis result for SHA-256 b082b5ed7c716120…

MALICIOUS

PDF

38.1 KB Created: 2020-08-30 23:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f2757e616fd7db87759a0629b14abec SHA-1: d27f900aab88c5bada240a80e96a1323f3c94d71 SHA-256: b082b5ed7c716120a17adb0cfd76347429f19c6169d6cb85c8536e43a43ef557
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=two+mexican+dances+for+marimba+pdf, which is likely the primary malicious payload delivery mechanism. The PDF also contains a mass of external links to other PDFs hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic.

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.com/wix?keyword=two+mexican+dances+for+marimba+pdf
    • https://static.usrfiles.com/ugd/96768c_bf7e9850a92c4f2fa9c754bda48099cf.pdf
    • https://static.usrfiles.com/ugd/269bb8_0bdc5e6dc2d1433fbad4ef000edbafae.pdf
    • https://static.usrfiles.com/ugd/ce77c6_444672693e7840c1aa5e4ef6c215bb70.pdf
    • https://static.usrfiles.com/ugd/3e5d97_5cdb68cd92fd411996bcb1174035bd35.pdf
    • https://static.usrfiles.com/ugd/b8c837_5360837f048243f5b64ed894b6c65273.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d857966b17f415e9e175e82239d8f4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec98312f23d4465883f3d64519f1ab75.pdf
    • https://static.usrfiles.com/ugd/8b2c09_34825ff983524b20b817529539de2436.pdf
    • https://static.usrfiles.com/ugd/49be48_e67b69c5038346d1a061b0cd10f36d0f.pdf
    • https://static.usrfiles.com/ugd/3eed2b_dd9f667abe4147cc9ec4e4a6f833bedc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee97749bb1d04e2f90c42d5872c6ea91.pdf
    • https://static.usrfiles.com/ugd/71fd01_f14333e74825487b90fdd55dab17f08e.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/lobaguputevonagibolebejat.pdf
    • https://cdn.shopify.com/s/files/1/0437/4573/8903/files/python_rename_column.pdf
    • https://cdn.shopify.com/s/files/1/0433/3489/3721/files/88549778992.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/report_on_road_accident_in_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0463/6380/3803/files/bichagadu_full_movie_telugu_2016.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_off00004c58.bin
5ae111aea482db03797961451bdded095d1f5da766c0285446a4de84bccb1b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C58 5516 bytes
font_01_sfnt_off00005f08.bin
16d37fcc56ad2f692d9c1b858fe0a4abdc904a0158c20255accf8cf59871a903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F08 2092 bytes
font_02_sfnt_off00006810.bin
2c95f3d50432f8ab3fa8564a39fdba87bf0b3c578b613fd5091a7dce61aeb5d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6810 9700 bytes

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