Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fe0c105afba857…

MALICIOUS

PDF

39.2 KB Created: 2020-09-08 06:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19f862b77da1239938a6c572c86c2b31 SHA-1: 49b135da56f57eddc34fc802f9c323d93f949ee3 SHA-256: a4fe0c105afba857695d06cf37cccb62b8d811270c9ca4c154c53b3127bb2938
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded external links, many pointing to a redirector. The document body contains text that appears to be a lure, referencing 's m d b full form' and including the malicious URL. The ML classifier strongly supports the malicious verdict. The primary attack pattern involves redirecting users to potentially harmful content.

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=s+m+d+b+full+form
    • https://static.usrfiles.com/ugd/c33cdb_f3dcf20b8a244573bb46b3c586997904.pdf
    • https://static.usrfiles.com/ugd/0182ef_f9f78def1a6241f4961b2b9793d5a47b.pdf
    • https://static.usrfiles.com/ugd/6f53d7_b5813e96020b493a8cd53972b7afcc75.pdf
    • https://static.usrfiles.com/ugd/b8c837_40d34b86a97e4ce386a98cf9001e2cc5.pdf
    • https://static.usrfiles.com/ugd/85c99c_cc8334e40ed4483d890a5804a5422b8b.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/dovera.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2224/files/22228374331.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7660/files/22984967102.pdf
    • https://cdn.shopify.com/s/files/1/0430/4188/2265/files/veteloxebofokanil.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/sodatetuguge.pdf
    • https://static.usrfiles.com/ugd/cbe325_37ac067966f342e9b99e3e8e3cc4e820.pdf
    • https://static.usrfiles.com/ugd/ebc5f9_c60e0a32219f460e9bd44a72f8521234.pdf
    • https://cdn.shopify.com/s/files/1/0437/9846/2624/files/78621791802.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6330/files/rajaxupiwibomis.pdf
    • https://cdn.shopify.com/s/files/1/0428/5772/6118/files/fedapukomejebevimodiri.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_off00005e3f.bin
32a7cf0e38a2c1b778fa5190c0b6ed9370453f9770b76dc0a6ac5aafcd3acaa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3F 4908 bytes
font_01_sfnt_off00006eda.bin
4b664e584f4a6dfdff1da21fc235f3725fab27974191a8036e63ddfe648ff374
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDA 9848 bytes