Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d26d94b87e973d…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 17:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f31d5d18cd660c998e81eeac68ef0fe2 SHA-1: 1e3683aa7ca71e7444b110b19aa7d2d9380ef60c SHA-256: c5d26d94b87e973deae81a83d24d3b42cdbf2663c4295be928555bbfed78ac94
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a PDF link to known malicious redirector infrastructure at 'ttraff.ru'. Another critical heuristic indicated a PDF link farm, with numerous external PDF links, the first of which is 'cdn.shopify.com/s/files/1/0432/4058/7423/files/grammaire_progressive_du_francais_de.pdf'. The document body contains garbled text but also includes the aforementioned URLs, suggesting a lure to external 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.ru/pify?keyword=bootstrap+responsive+product+slider+free
    • https://cdn.shopify.com/s/files/1/0432/4058/7423/files/grammaire_progressive_du_francais_de.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/37392468753.pdf
    • https://cdn.shopify.com/s/files/1/0431/9746/4731/files/volilizebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/gepugiparedarajekakawum.pdf
    • https://static.usrfiles.com/ugd/c7a620_88765b89b40e423a9193996ee0174d23.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad56bf27fbdd4f50aa7d76d2fb30a763.pdf
    • https://static.usrfiles.com/ugd/10a4aa_117f919b74ac4cbb9f17929f1709ef8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5707c12e29d44e2ba63198a333392d98.pdf
    • https://static.usrfiles.com/ugd/b8c837_57ff512707e844248063155b12a8eefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/68025098201.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7148/files/kubota_l3000dt_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/bandura_theory.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/rutitotu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8932/9312/files/schedule_1_cra_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7804/1244/files/chief_information_security_officer_license.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7175/files/19195792609.pdf
    • https://cdn.shopify.com/s/files/1/0436/1152/1187/files/2017_ram_2500_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/91210290724.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0154/files/cg_budget_2020_download.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_off00006758.bin
0383059774d7a7c1afc695904adc3e2e5cb189ff542cc752057e7388d3d5a6fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6758 5256 bytes
font_01_sfnt_off00007954.bin
ec389278698bc675c1a7f8ca01f1c406d36a9be2ad14275c30dc2e999807e3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7954 10028 bytes

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