Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8876e3688f740b…

MALICIOUS

PDF

54.8 KB Created: 2020-08-04 22:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10796588aa7b24b6fdb1c0b41c659a07 SHA-1: 3ec3d289c35502e4704df71852cf2930ad282379 SHA-256: 4f8876e3688f740bc8ae17468680af80b592bc20f9cf877e624d0ab09c7c2f2b
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains a URL that matches the malicious redirector. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or credential harvesting.

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=flight+aerodynamics+pdf
    • http://xelubo.thelightingsummit.com/uploads/1/3/1/4/131454024/3369954.pdf
    • http://files.maritzavives.com/uploads/1/3/0/8/130874222/dotel_vavaroxagef_baxuwobebanexug.pdf
    • http://files.nanasrecyclables.com/uploads/1/3/1/4/131452903/nezujoj_rejilobinip_vigiwipulijuxi_sodoxiriviwa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/pisevo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5382/files/85795485203.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/17522754702.pdf
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/how_to_compress_a.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/sbi_credit_card_statement_password.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9735/files/zoronor.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/56663611543.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/94188275269.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/fanurelobadumiwaxebugidet.pdf
    • https://cdn.shopify.com/s/files/1/0446/0973/2771/files/developing_tactics_for_listening_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/34080639417.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/jupiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/mudexix.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/74097772301.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097dd.bin
a85a09c95dab03711fef49c1498cf776fec820dc154357f0bbfb8dbdf5af993e
pdf-font-stream PDF embedded font (sfnt) at offset 0x97DD 5628 bytes
font_01_sfnt_off0000aae4.bin
fb634fa702cba794f6d69d2f6fbbc117e73e41c82cdd265a7595324689c018ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE4 10252 bytes