Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55668d629626e85…

MALICIOUS

PDF

48.4 KB Created: 2020-08-01 07:39:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1f79df3afc89ff57529eb1fa403fe41 SHA-1: 7bf30bcfc6f7575a7e2c9f18f8249e28d6ce1309 SHA-256: c55668d629626e85178ffee23c0dc184bc569f096c310697a977830481826160
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to shopify.com domains, but one critical link directs to a known malicious redirector. This suggests a phishing or redirection attempt. The ML classifier strongly supports the malicious nature of the PDF. No scripts were extracted, so the primary attack vector appears to be the embedded links.

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=wind+death+knight
    • http://files.tgmwindsteppers.com/uploads/1/3/1/4/131437322/1823146.pdf
    • http://files.cprep.org/uploads/1/3/0/7/130738836/vukudusuri-lalali-wowiwukivasox.pdf
    • http://files.message6666.com/uploads/1/3/0/7/130738704/1e0a1fd35a.pdf
    • http://files.belouge.com/uploads/1/3/0/8/130874403/midutakup-givinumowaju.pdf
    • http://files.adrianpollard.net/uploads/1/3/2/6/132682990/pabemow.pdf
    • https://cdn.shopify.com/s/files/1/0435/9772/5864/files/73705049097.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/5632679098.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/39508437136.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/86694166843.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/dizuzalefefebavuraz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/24717548176.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/33041521308.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1882/files/valunikeliwizujolosezim.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/puzepit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6394/files/nitifurowo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b3d.bin
4fde88aa1cda8b4633dbd0037f84c123eb61a61ef5fbbf4c8ccd7092cb667c73
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 4856 bytes
font_01_sfnt_off00007bd4.bin
5bff03624c84bec6975f4e0c8a75f47611a4c05bc124d6e127bd83e2be983e7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD4 10656 bytes
font_02_sfnt_off00009ffb.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FFB 16092 bytes