Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e60ecf49d20cfb…

MALICIOUS

PDF

36.0 KB Created: 2020-08-31 00:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21bc782b8bf628cf4037b675f187e3fb SHA-1: 101569afd60e7cbac0891e83472191a26e9410e5 SHA-256: 74e60ecf49d20cfbbf6d48c1c43e47eaca51ebd987098fb5b2fcb7d1d7aed05f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a repair manual, aiming to lure users to a malicious site. The PDF also hosts a large number of SEO-optimized links, likely to obscure the malicious redirector. The ML classifier strongly indicated maliciousness.

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=auto+air+conditioning+repair+manual+pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/jupyter_notebook_cheat_sheet_ibm.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ninitegabi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/belexaleguzizazodow.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/supux.pdf
    • https://cdn.shopify.com/s/files/1/0429/1212/0998/files/pananaliksik_tungkol_sa_asignaturang_filipino.pdf
    • https://cdn.shopify.com/s/files/1/0430/7841/8583/files/wapujezi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5339/0743/files/probability_theory.pdf
    • https://static.usrfiles.com/ugd/df4650_d3d3a9a8e803457a9d40998fb05ff0ef.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_190c4dd61e904396a97f1329ded6b8e4.pdf
    • https://static.usrfiles.com/ugd/f63f29_72b8c78bcf42485e9d48d73768c7feb7.pdf
    • https://static.usrfiles.com/ugd/4d6844_1b3fbf6d5d3b4d7dad4ef9945c8867cd.pdf
    • https://static.usrfiles.com/ugd/f09a9d_30249bd865184284af4e736806e3e861.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fb2fd4edc2844a7b26d68894e4b97a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_377eb5b8a1364edd89a3078e171b4596.pdf
    • https://static.usrfiles.com/ugd/26938b_de33558d6080412ab5730b658330bf7e.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_off00005036.bin
b90e54a012fcbe96ffbf0a02b5646066f83d7a174e720009fa9287b358bc3556
pdf-font-stream PDF embedded font (sfnt) at offset 0x5036 5284 bytes
font_01_sfnt_off00006218.bin
53004f51082e7c2383ff1b696abab300b09c144aec6d3afc70cf8b557191fc68
pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 9664 bytes