Malicious PDF — malware analysis report

Static analysis result for SHA-256 5022ef35a6a639d7…

MALICIOUS

PDF

47.9 KB Created: 2020-08-30 12:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f215452255ebd03b180229cbb52cf992 SHA-1: d4032a30d60de9fbdbfac5862bd6609b0f9f2d56 SHA-256: 5022ef35a6a639d77da2c5831a742f740772eb1eb1b6d04f0697620877970240
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL that is designed to trick users into downloading a driver. The ML classifier also strongly indicated maliciousness. 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.cc/wix?keyword=driver+robot+download
    • https://static.usrfiles.com/ugd/b8c837_2c1c2a3713ab43eab5e5e0d28b856f2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2385d517cd24c5f8a47f9ca32f2eb64.pdf
    • https://static.usrfiles.com/ugd/a58b01_7374ce3a6d07461392484668d9e08f7f.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/51189705649.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8854/files/26613654698.pdf
    • https://cdn.shopify.com/s/files/1/0462/3043/8039/files/calendar_ortodox_septembrie_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/6146/0644/files/82499667693.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6685/files/bomefomilugaxejanofuberig.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/jak_3_ps_vita_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8080/9622/files/bodies_by_rachel_28_day_shred_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/horn_vs_antler.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/windows_vista_bootable_iso_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/avison_young_vancouver_industrial_report.pdf
    • https://cdn.shopify.com/s/files/1/0441/1860/5976/files/online_biodata_format_for_marriage_in_marathi.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_off00007c92.bin
c8640803e4f25de35174b9014e02ee3c61546ccc1321826f3444000655edeafe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C92 4932 bytes
font_01_sfnt_off00008d7c.bin
377df5f4354568d8318dcd1254d3ffcd26e178076285f97e36a2da346aa7f704
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7C 10936 bytes