Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67b99e31df4abc0…

MALICIOUS

PDF

48.0 KB Created: 2020-08-12 15:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0efa22590453e1f49c586fcf8aa4ea03 SHA-1: 62f0612f37401d021413b68c12b507a7fac105cf SHA-256: b67b99e31df4abc09e06d1c077dfa53873cd0051fde43a9593322508277f4188
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=yasin+surah+pdf+file', which is a known malicious redirector. The presence of a large number of external PDF links, many pointing to benign Shopify domains but also including unknown and potentially malicious domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. 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=yasin+surah+pdf+file
    • http://files.beithashaar.com/uploads/1/3/1/4/131437806/8265621.pdf
    • http://zuwepa.jolipbooth.com/uploads/1/3/2/8/132814930/wulamiwaropojizi.pdf
    • http://files.ifsandwerestonemusical.com/uploads/1/3/2/6/132682655/cbffb040.pdf
    • http://ragane.greenvillechoralsociety.com/uploads/1/3/0/8/130814328/waxadixefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0743/4142/files/argumentative_speech_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/76350280191.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/vomojiraranewuxisab.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/webemaxoligoxiwedi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1752/files/17598513961.pdf
    • https://cdn.shopify.com/s/files/1/0432/0401/8336/files/12185235416.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/28415406784.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/jerupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7968/files/xawefokalomodudujazaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/kaneduwakojaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/bihar_si_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5018/8443/files/jurituzilowalisopateliki.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_off000065a2.bin
a674d976e6ea697555247974ee99e9be696282f9e0924403148e712bc089329c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A2 5092 bytes
font_01_sfnt_off000076e5.bin
92b178b7b1c4a85e780e8235ce7b4d97cf1aaf255c170b4e6e123d33cc2faae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E5 10860 bytes
font_02_sfnt_off00009bb9.bin
7799cc578944ea27f776c148d498a23748daee036f64c0e32fe755f03f097aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB9 16324 bytes

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