Malicious PDF — malware analysis report

Static analysis result for SHA-256 194b72d334978ec3…

MALICIOUS

PDF

47.2 KB Created: 2020-08-18 17:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16e1d42a0729a8ecf3b9bcadfa1c472a SHA-1: 59ee7129849aac52a22bcaabe288c66c8d3650e7 SHA-256: 194b72d334978ec361c1d9ee5afc836456f311c527a1e3349574f379b9d5c043
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a manual, and the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm or spamming operation. 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.ru/pify?keyword=deepmind+6+manual+german
    • http://files.freshskintattoos.com/uploads/1/3/0/7/130775679/pasibol_zavisomomiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5448/8990/files/alphabet_military.pdf
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/wow_classic_tailoring_guide_horde.pdf
    • https://cdn.shopify.com/s/files/1/0449/0412/0475/files/a_jar_of_mind_maggots.pdf
    • https://cdn.shopify.com/s/files/1/0435/2812/6618/files/8637296181.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/binovobupufuga.pdf
    • https://cdn.shopify.com/s/files/1/0452/3006/3773/files/list_of_all_formulas_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/9853085564.pdf
    • https://cdn.shopify.com/s/files/1/0431/7305/2575/files/ccie_routing_and_switching_v5_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3499/files/55772577529.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/82412877570.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_off00007af7.bin
b63cbaba290aa4e0a195cebee3dd120d8757ea42b363d9de98c1abac25fb13c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF7 5256 bytes
font_01_sfnt_off00008cb6.bin
6d9354ef2db5f256db2a6612a86282f4f841e7d93d2212209aa8ae81e27a35e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB6 10480 bytes