Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a8654d590df420…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 11:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11510517cf65fb284c5201d941f4ee57 SHA-1: ce68cc9cdb65b7a6510ab16b6748b0da39ec3d4a SHA-256: 40a8654d590df4201476ab5e8ae841cfdf99872d5306e44d241e310f147daa61
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised as a wiring diagram. The document body is heavily obfuscated but contains the URL and references to wkhtmltopdf, suggesting it was generated programmatically. The presence of numerous other PDF links, many pointing to Shopify, indicates a potential link farm or content distribution strategy, with ttraff.com being the malicious entry point.

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=gmdlbp+wiring+diagram
    • https://cdn.shopify.com/s/files/1/0431/2314/6909/files/bavovumorumafazudimug.pdf
    • https://cdn.shopify.com/s/files/1/0434/0252/6887/files/biomedical_waste_management_amendment_rules_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/56834505772.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/79444471368.pdf
    • https://static.usrfiles.com/ugd/e73fea_2c57d775127d431bbe1c68304166b5e6.pdf
    • https://static.usrfiles.com/ugd/b7ab08_ee7a1a3efc234393a8dbd1ed0b7e7c3a.pdf
    • https://static.usrfiles.com/ugd/8acad3_8a31106c89a84bf1987eb1037088a93e.pdf
    • https://static.usrfiles.com/ugd/52b593_3e872e410ad449ebad7840d3b7dedcdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2069fcc385d483c8417b5d2b6ac7d3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_75d5d82399a74aec98401ac42c2378e0.pdf
    • https://static.usrfiles.com/ugd/01bc73_0613659e1b1d41c29e574be498aaf82a.pdf
    • https://static.usrfiles.com/ugd/0baf77_315cff6e322f4ee78e18f4d5e58c5ac1.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/3889158837.pdf
    • https://cdn.shopify.com/s/files/1/0435/1809/9615/files/gasotukodedodir.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_off00005f28.bin
91ce6104e8dd8aa72997a9749a42fbc55c46582e31a19a65cfaf02467b876447
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F28 5364 bytes
font_01_sfnt_off00007161.bin
f656ca76cd25a81d1d47280f7084305a29f192361fa2ecb7935bc14de633a488
pdf-font-stream PDF embedded font (sfnt) at offset 0x7161 10148 bytes