Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c083de4ca8c044…

MALICIOUS

PDF

49.4 KB Created: 2020-09-02 18:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e4f82d0a0c653386691ca0390abea19 SHA-1: 63978f6393195bba9e4c1587b3cc3864becfef55 SHA-256: f3c083de4ca8c0448c01f43a373fd415679ab65e99c969af71f927a5adda3ea8
152 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'free whatsapp status songs in tamil' and the malicious URL itself, suggesting a lure to entice users to click the link. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to a potentially harmful site.

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.cc/wix?keyword=free++whatsapp+status+songs+in+tamil
    • https://static.usrfiles.com/ugd/dd6616_0512c3b4aeed44dd9a3808b07e2fd0ba.pdf
    • https://static.usrfiles.com/ugd/0582e0_a730cd6dd2cc431180116f2246a345d0.pdf
    • https://static.usrfiles.com/ugd/6f9b04_56f94db18a8e4b5ebc861e9edf1a401b.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/jidixaxunuwelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/welomototesesiju.pdf
    • https://cdn.shopify.com/s/files/1/0437/9469/4304/files/triple_bottom_line_csr.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/potekejobikoxupivore.pdf
    • https://static.usrfiles.com/ugd/2ac701_4894bb19bee54c28948c9393460e7777.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8873021ca7949f9a9aab3c01abd3296.pdf
    • https://static.usrfiles.com/ugd/902d29_db7a56a31cb74a1d8d95b612db92bb56.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6f038eb6dce4d23bb1f7da16ae09421.pdf
    • https://cdn.shopify.com/s/files/1/0438/3653/9045/files/4th_grade_math_teks.pdf
    • https://cdn.shopify.com/s/files/1/0436/3878/4158/files/87664085588.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_off000084d2.bin
7b37c512414b24db0fc69f7468979b2e47c1aef3280cda18f7fb82e6b723498c
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D2 5280 bytes
font_01_sfnt_off000096b2.bin
ce54ccd83b08faa1b3e741cbe819d9774afbce1cdb84a9d376367c2bbbbade84
pdf-font-stream PDF embedded font (sfnt) at offset 0x96B2 9948 bytes