Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acf0d917d818726…

MALICIOUS

PDF

44.0 KB Created: 2020-09-03 00:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5161230f17c1a32389b70990c288beb SHA-1: 0b92f40de5a8c89c49d4b08620c67330d5f69721 SHA-256: 3acf0d917d81872612d0446729e664ee59bf2bbaffeb912d9f7a5c3a5f17a5d4
152 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external PDF documents, with one primary link to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL and keywords suggesting a lure for a scam. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm designed to distribute malicious content.

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=tamil+a+movie++hd
    • https://static.usrfiles.com/ugd/229b11_be1ba088ab5041c08f75ac0be5099017.pdf
    • https://static.usrfiles.com/ugd/f46427_b323296582374d43a4baad1401a9256e.pdf
    • https://static.usrfiles.com/ugd/0779a3_00f99676c5904664aa0c04e0a232cd41.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d50b7e52fc346ba9299f91c652bb6f6.pdf
    • https://static.usrfiles.com/ugd/45e30f_afd3c885873b43d0a63c5466653492d7.pdf
    • https://static.usrfiles.com/ugd/ac72e0_76ea105845344a0a963ba2f5460d482f.pdf
    • https://static.usrfiles.com/ugd/24853a_91217d4079ff4700b1dc842953afc82a.pdf
    • https://static.usrfiles.com/ugd/f84671_9981bdf2f9654a2096605c78cee9ed2f.pdf
    • https://static.usrfiles.com/ugd/a98ecc_9b4327a7081542d2981b0496661d9c7d.pdf
    • https://static.usrfiles.com/ugd/17beed_4411c6ad388a40b5b9565c73256a41d6.pdf
    • https://cdn.shopify.com/s/files/1/0433/1103/8632/files/31208394683.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/rutituxumusavu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8945/1416/files/chevy_cobalt_transmission_rebuild_kit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/sainik_school_balachadi_admission_form_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/kulud.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_off00005b0e.bin
f881ee43fb3f07d19634df8ffc022a04f2903e06bd7d97036c2d7411a1103312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0E 4800 bytes
font_01_sfnt_off00006b3c.bin
a05089af7df5965be4c211dd9fe0019f94d2e88a36d247ebbc72cc240785e2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3C 10040 bytes
font_02_sfnt_off00008db3.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB3 16164 bytes

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