Malicious PDF — malware analysis report

Static analysis result for SHA-256 a816917de01d8ba1…

MALICIOUS

PDF

39.6 KB Created: 2020-08-17 02:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e29c5850e8ca657bce6601a83d58d297 SHA-1: 86e6b67457dec61d38a08f3de9d3c77c150af091 SHA-256: a816917de01d8ba11c9f0cea4d81dd3df6a4a42937e5400cb44b3077d13ae623
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, many of which point to benign Shopify domains, but one critical URL, 'https://ttraff.cc/pify?keyword=bangla+funny+cartoon+video+mp4', is identified as a malicious redirector. This suggests a social engineering tactic to drive traffic to malicious infrastructure, likely for further exploitation or malware delivery. The ML classifier strongly supports the malicious nature of this PDF.

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=bangla+funny+cartoon+video+mp4
    • http://files.blakkanvas.studio/uploads/1/3/1/3/131381850/zokufepiladod.pdf
    • http://files.shineskillsforlife.com/uploads/1/3/0/7/130739126/9657014.pdf
    • http://files.eastbudleigh.org.uk/uploads/1/3/1/0/131070911/a5eedc61004787.pdf
    • http://files.coachingandcounsellingottawa.com/uploads/1/3/1/6/131606257/1941667.pdf
    • http://tibalup.carolsuereader.org/uploads/1/3/0/9/130969060/826256.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/64570332321.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/43232201346.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/lujanusutu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5413/6473/files/flat_belly_meal_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/flash_cs3_actionscript_3._0_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3019/files/watajogudolexetogumolugo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/upsc_assistant_commandant_2020_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6852/2657/files/zusiboti.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/2013_chevy_cruze_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/python_tutorial_point_for_beginners.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_off00004e86.bin
f978688d43fd37bde1a82c80971f458f90b2cc5b71abff01c3bd4f4c9ca1c063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E86 5476 bytes
font_01_sfnt_off00006120.bin
673e6ef4e0265ad89b8c254a59674de607b63f058c86abb58342972f03b40239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6120 10040 bytes
font_02_sfnt_off00008377.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8377 4324 bytes

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