Malicious PDF — malware analysis report

Static analysis result for SHA-256 589ec755cc8527f7…

MALICIOUS

PDF

53.6 KB Created: 2020-08-06 14:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22fb218b9e62b85f4ec7317fa1303375 SHA-1: ec743dc81710e74b4d1ab530bb03356afd8f306a SHA-256: 589ec755cc8527f7fd1828bbd229142e357a0eec065c670582ae6612a524606b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary malicious link identified as a redirector to 'https://ttraff.ru/pify?keyword=argumentative+essay+samples+pdf'. The document also exhibits characteristics of a PDF link farm, with numerous links pointing to external PDFs hosted on platforms like Shopify. This suggests an attempt to manipulate search engine results or distribute content through a network of linked documents. The ML classifier strongly supports the malicious verdict.

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=argumentative+essay+samples+pdf
    • http://files.dawnstastyspoon.com/uploads/1/3/0/9/130968920/bajatutudofa_ponosiv_tonavo.pdf
    • http://files.nataliekeymist.com/uploads/1/3/1/4/131437530/8250131.pdf
    • http://files.lukefranco.org/uploads/1/3/0/7/130738812/pamejenax-wanaxa.pdf
    • http://files.woodlawncountryclubfc.com/uploads/1/3/1/6/131636972/lariragovof.pdf
    • http://zifaguki.tajaddodorthodontics.com/uploads/1/3/2/8/132815002/03cb82d1b7e26.pdf
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/53426431898.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/47273638590.pdf
    • https://cdn.shopify.com/s/files/1/0429/0494/4807/files/48601338001.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3240/files/fogolede.pdf
    • https://cdn.shopify.com/s/files/1/0431/3543/4901/files/93926545667.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/bob_net_banking_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0746/files/sejelodom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/13300448029.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/85016112885.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/pdf_writer_mac.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_off00009255.bin
30818951e6d4cccf987517a1ceeb87b4d53bc1bacc3a908d5f113f87a8970b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9255 5512 bytes
font_01_sfnt_off0000a50e.bin
2e0347770a14c7d2de9c4ce141c8be80eee9a69de4d059703a7550d6269c65c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xA50E 10640 bytes