Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b909edd13110f77…

MALICIOUS

PDF

73.8 KB Created: 2020-08-25 06:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f49b978bf6fec1d69d686fa9c5cdbf0 SHA-1: 40c2316da6426c16c72d79f0f6809609757548c5 SHA-256: 4b909edd13110f7790f4ec2240b79410fba4e480395c4851a5d5f2416803907c
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL. The presence of a PDF link farm heuristic further suggests an attempt to manipulate search engine results or distribute malicious links broadly. No scripts were extracted from this sample.

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/pify?keyword=caligula+movie++movies+counter
    • http://wubixixoj.madocrocks.com/uploads/1/3/0/7/130775923/zonepinekusewogazo.pdf
    • http://foxaxujid.quiltedpics.com/uploads/1/3/2/8/132814930/risolu_xukoku_fijomubipega_tovisinonidew.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4583/files/fupiluvedes.pdf
    • https://cdn.shopify.com/s/files/1/0439/2573/3531/files/cricket_score_sheet_in_c_program.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/70401621227.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/buxamaxipuromos.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/71063119636.pdf
    • https://cdn.shopify.com/s/files/1/0427/8566/9279/files/bizixebibadesaronajim.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9578/files/bienestar_social_unam.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/chancroid_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/21985005010.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/51180801276.pdf
    • https://cdn.shopify.com/s/files/1/0437/3017/4113/files/57950294680.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/xodupuxulukilomosafur.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_off0000e3d5.bin
2e6c45221583c1c01621915818bb4d1fafd36cdf8aa6ccbfea2e2ffc91d10c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 5084 bytes
font_01_sfnt_off0000f515.bin
cbeba5046b807c4eb1602fb89a1648519754e713a5b81db87b8d141f37f6b7a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 10872 bytes