Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6edb50a4fb8a74…

MALICIOUS

PDF

42.3 KB Created: 2020-07-13 00:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32718de7a250dd1c81b513180482f1c8 SHA-1: 916dda5d927f2d3a408dd0664a5ee3c3b87fc4bc SHA-256: 5a6edb50a4fb8a748f62c974dce2b0f6ac7f1f715f6f025ce8c78abd4488360c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a malicious intent to direct users to harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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=autodata+3.40+fr+utorrent
    • http://files.tetoncountydems.org/uploads/1/3/0/7/130776249/zepotuwuguku.pdf
    • http://files.theplayfulpalate.com/uploads/1/3/1/3/131379874/3e279.pdf
    • http://files.mizpah36.org/uploads/1/3/1/3/131379045/6624586.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://mewalujatu.files.wordpress.com/2020/07/93988289741.pdf
    • https://warafij.files.wordpress.com/2020/07/bugajobosojoku.pdf
    • https://zunoxavememo.files.wordpress.com/2020/07/97577116066.pdf
    • https://gigifovagipe.files.wordpress.com/2020/07/mokokupakidorefu.pdf
    • https://busamonavek.files.wordpress.com/2020/06/99745654081.pdf
    • https://jejiwivu.files.wordpress.com/2020/06/toxufir.pdf
    • https://mameloga.files.wordpress.com/2020/06/42974377467.pdf
    • https://nuvosunogad.files.wordpress.com/2020/06/66729466100.pdf
    • https://wisixabapux.files.wordpress.com/2020/07/72809999338.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/78119570512.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdf
    • https://cdn.shopify.com/s/files/1/0433/7926/1590/files/71882252479.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5965/files/pegajowuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kulabegidubonigupux.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/mekopajipaputusa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f3.bin
fedde6cea36e8f634efd4896ba48ccc3439db1a2f1f10d380aed9062bcd336a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F3 4940 bytes
font_01_sfnt_off000078ce.bin
fa4560812338954f1242331d04d3fcf03cc4fbd645dc368bd5270d07c561d5e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CE 10208 bytes

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