Malicious PDF — malware analysis report

Static analysis result for SHA-256 868c5cf38d360112…

MALICIOUS

PDF

45.7 KB Created: 2020-07-29 19:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27bf9e18a1fa7b195cf65cbf8fccc741 SHA-1: ee73bead0395d47e4d9beff8aa4fabede7c40431 SHA-256: 868c5cf38d360112874577c65e3651e59d59c2ec12cd051dbc015afbd03026b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, with numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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.cc/pify?keyword=amplificateur+de+brillance+pdf
    • http://files.alleghenybuilders.com/uploads/1/3/0/9/130969254/tobebomam_rewekibamakob.pdf
    • http://files.magicvaper.com/uploads/1/3/0/7/130775245/duzom.pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdf
    • http://files.hillfarmhistoricalsociety.com/uploads/1/3/0/7/130739274/300732.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/40521236071.pdf
    • https://cdn.shopify.com/s/files/1/0437/1149/6347/files/laronowezizobip.pdf
    • https://cdn.shopify.com/s/files/1/0429/4836/2399/files/wasuduwapajaxakosulibok.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/dufinejedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7613/2774/files/bikojezemubifawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/mogejekisakinaret.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/63574181169.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/gobupijugitesamakepuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/5778/9593/files/titafezusepu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/sidetikusofekiwegegiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/wupozemiwigogojixema.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/
    • https://cdn.shopify.com/s/files/1/0429/4836/2399/files/wasuduwapajaxakosulibo

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007149.bin
5934696e9f72df3d8f7a873f143f3b5ac22ee04722b080109ef52f69f1c2230b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7149 5024 bytes
font_01_sfnt_off00008235.bin
4c994f18d6e5309876d26e3a0d714f0f91c91bd23a0430b5d76596c772c35a01
pdf-font-stream PDF embedded font (sfnt) at offset 0x8235 11860 bytes