Malicious PDF — malware analysis report

Static analysis result for SHA-256 3befe5561281648d…

MALICIOUS

PDF

45.2 KB Created: 2020-08-07 13:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afd52cabe6241ffbdb0b6a1a1a555c4a SHA-1: aea2ffe9a27f5e2a978cac461a0743ea9af211f4 SHA-256: 3befe5561281648d1c776acffdf0a8b8031b1c08375731d5571635da5eadaabf
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a document about hernia treatment. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and PDF_SEO_LINK_FARM indicates a large number of outbound links, many hosted on Shopify, likely to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector is the malicious redirector link embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=hernia+hiatal+tratamiento+quirurgico+pdf
    • http://files.rmqiwins.com/uploads/1/3/0/7/130776619/zonogogivuda-jowasekogigixa-bixub-lomofoj.pdf
    • http://tajip.cardiffpilatesstudio.co.uk/uploads/1/3/1/4/131438539/2859efa05.pdf
    • http://duwuku.bigfatsmile.io/uploads/1/3/0/7/130738943/cd505b338.pdf
    • http://files.offthegrid24.com/uploads/1/3/2/7/132712358/fokebujegitepopives.pdf
    • https://cdn.shopify.com/s/files/1/0437/4478/8634/files/pobufazoxuropuzefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2114/files/zozomuvadojosa.pdf
    • https://cdn.shopify.com/s/files/1/0435/0060/1504/files/7072441892.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/94467994338.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3090/files/10507658308.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/71893376514.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/98102274182.pdf
    • https://cdn.shopify.com/s/files/1/0440/0332/8150/files/d_d_5e_monster_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/volume_locked_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/catalogo_recompensa_total_banorte_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/tobawedi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/nudogudizadaxik.pdf
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/kodoriloxoxetozoleziwula.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/xenulekamerugosurevuluro.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_off000069e1.bin
8bd0ceb40fa6ea0cf9778c4f03a0255691a592dd4bb56b42d9f7b08027195b90
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E1 5476 bytes
font_01_sfnt_off00007c4e.bin
be4662aac3d77515d5d0d1dc7dc7e520dcb61b396b0081d9f567a5bfa04e4725
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4E 13040 bytes