Malicious PDF — malware analysis report

Static analysis result for SHA-256 5439c30b171ab658…

MALICIOUS

PDF

56.8 KB Created: 2020-08-12 10:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21cfac81f6b223d70236ea364e6926a1 SHA-1: 0dbd02b1c9a4b06e882423aa70e76a7421cf5eec SHA-256: 5439c30b171ab658373ea129f7ae8b7f8bcdbab8c3990c3bf982e42fe1372fcf
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at `ttraff.ru`. This suggests the document is designed to trick users into visiting malicious infrastructure, likely for further exploitation or credential harvesting. The presence of a link farm further indicates a malicious intent to distribute traffic to potentially harmful sites.

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=cards+against+humanity+cards+pdf
    • http://files.k1academy.ca/uploads/1/3/1/4/131454345/1122330.pdf
    • http://files.happyphoneunlocking.com/uploads/1/3/0/8/130874067/lesato.pdf
    • http://files.cobaltcounselor.com/uploads/1/3/1/1/131163736/81ef1111f814.pdf
    • http://files.themurphyfund.org/uploads/1/3/0/8/130874332/1cc13c.pdf
    • http://sadefo.bearfootdoctor.com/uploads/1/3/1/8/131856917/fokazivaketanivo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/wubenuramisagadumapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/tesirutokoru.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/linux_bash_scripting_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/shakespeare_sonnets_love.pdf
    • https://cdn.shopify.com/s/files/1/0435/5512/7459/files/optics_hecht_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6397/files/zababoxuxiwat.pdf
    • https://cdn.shopify.com/s/files/1/0431/9644/8917/files/xawejejoxufevavovasosetug.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/jisufuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3740/0999/files/black_mamba_boy.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/49155711653.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_off0000931c.bin
0d390a62062cec51a0266619dbb73ace279370ed09b64e84a9046c5cb7f70ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x931C 5316 bytes
font_01_sfnt_off0000a507.bin
7646170bcd90c3db6cd328403fea61ec24c18878875712622b8815d80fd499b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA507 10288 bytes
font_02_sfnt_off0000c845.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 4324 bytes

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