Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfd047ba83995ef…

MALICIOUS

PDF

42.0 KB Created: 2020-09-05 05:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c26e7919e70cf4ef62889b738f2e62 SHA-1: 3906340da167baaeafdcbc41b5c41b54358a68f1 SHA-256: bbfd047ba83995ef9461e5ac762a8ead19e937ca6915380d6ee11286184e7363
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.club'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 'static.usrfiles.com/ugd/e56fe2_9eca287cabc142a987fa98ef2589c6e8.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure 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.club/wix?keyword=generation+z+definition+pdf
    • https://static.usrfiles.com/ugd/e56fe2_9eca287cabc142a987fa98ef2589c6e8.pdf
    • https://static.usrfiles.com/ugd/1e4819_826bcceeb0ec458e834ff28d537828af.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_02d9e3dba4494c07a2c9aa194702d2ac.pdf
    • https://static.usrfiles.com/ugd/50de67_7b0e21865d4949a2952e595d2e0b24f3.pdf
    • https://static.usrfiles.com/ugd/9d66c7_2e80a167dafa45e7bc70035041e1479a.pdf
    • https://static.usrfiles.com/ugd/d9f7b5_4922b9ee4d104cb4959f352a89596dd8.pdf
    • https://static.usrfiles.com/ugd/784815_b4820ad8a7e745e08bcbd08f907a44bd.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_1a843d51617e4a00a263214d54c10122.pdf
    • https://static.usrfiles.com/ugd/2c8d66_28b0e7e570d941c492ef2d61369a8ee4.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/55531913518.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/pererewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/argumentative_essay_sentence_frames.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/android_tablet_pc_10._1.pdf
    • https://cdn.shopify.com/s/files/1/0462/4436/4448/files/11579919021.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/52414648796.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0392/files/87464385462.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_off00006740.bin
434b9f58975fc008cebfd3a284212d2f52c060db4d978d6322372ae2e82a737c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6740 4908 bytes
font_01_sfnt_off0000780d.bin
5e4b19b1a2169ca545a8f0fe5fab0aa19b039ff48de67dfe94ed73c610e65e96
pdf-font-stream PDF embedded font (sfnt) at offset 0x780D 10196 bytes