Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8af153ab0eb001…

MALICIOUS

PDF

37.7 KB Created: 2020-08-31 08:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa45fad84e517d35285bb4aa0159474b SHA-1: 9faf915498a04d745e909052867d46c1742668f9 SHA-256: 1a8af153ab0eb00116c29a80844bbbc231f1ee2dcb0fd2857eac14b7b8c2dec3
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/wix?keyword=5e+robe+of+scintillating+colors. Additionally, another critical heuristic identified a mass external PDF link farm with 28 links, many pointing to shopify domains. The ML classifier also strongly indicated maliciousness. These findings suggest the document's primary purpose is to lure users to malicious sites.

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=5e+robe+of+scintillating+colors
    • https://static.usrfiles.com/ugd/0c268c_33892dce4eb4499689d14a10afb80c3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab90a2c16934972befaab0793c90418.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a0427ae06494434b9176ab59d5989b7.pdf
    • https://static.usrfiles.com/ugd/39d081_cc0bebb1c67040a18a5a5eaea91b4dda.pdf
    • https://static.usrfiles.com/ugd/d902bb_f2c3b51e451b41f0bbc2cc7de44dd427.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/6692466386.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/1684072469.pdf
    • https://cdn.shopify.com/s/files/1/0436/5657/7182/files/vemotepabuji.pdf
    • https://cdn.shopify.com/s/files/1/0465/0221/5838/files/fnaf_2_apk_indir.pdf
    • https://cdn.shopify.com/s/files/1/0429/1716/7267/files/break_up_letter_declaration_of_independence.pdf
    • https://cdn.shopify.com/s/files/1/0433/2974/9145/files/75930676132.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/2094511776.pdf
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/malefegu.pdf
    • https://cdn.shopify.com/s/files/1/0463/3414/8763/files/reboko.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_off00005403.bin
e6b6ee90338bb88ed64f493654974b25efb7da9ebc1d732e9f5fe3da56de7c86
pdf-font-stream PDF embedded font (sfnt) at offset 0x5403 5220 bytes
font_01_sfnt_off000065d0.bin
0b2a3d0711babac085aa827bf808ae9aa4ddf530e0cd3b0e891016a7121b036b
pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 10792 bytes