Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f04e0fc361c8fb…

MALICIOUS

PDF

40.6 KB Created: 2020-08-13 05:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26fc53e6444db496be54329f68a20ddb SHA-1: 6cb9e1b791ec866f7f64c42b1a25ab028d6b3b30 SHA-256: c2f04e0fc361c8fb4395a8cafb0b64bda1a33738c5102188edebc256368f75ef
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm. One of the primary links, 'https://ttraff.com/wb?keyword=catalogo%20boticario%20dia%20das%20maes%202019%20pdf', points to known malicious redirector infrastructure. The document body, though partially corrupted, includes the same URL, suggesting a lure to trick users into clicking through to malicious sites. The ML classifier also strongly indicated maliciousness.

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.com/wb?keyword=catalogo%20boticario%20dia%20das%20maes%202019%20pdf
    • http://kevuv.thecactusroom.org/uploads/1/3/1/0/131070792/fulumukosonuwose.pdf
    • http://files.poiseandco.com/uploads/1/3/0/7/130739198/mudegem_xoxumosazegez_zutalis.pdf
    • http://sarax.backcountryhunters.ca/uploads/1/3/1/8/131856158/daxisebuwoxok.pdf
    • http://files.simixtraining.com/uploads/1/3/0/8/130874110/bepeluruzudaxekevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/banavipubugasimipuwegafaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/nevadat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/77704053348.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/58649047503.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/15128513710.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0701/files/dosamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/75863950863.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/nvidia_graphics_card_not_detected.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/allen_bradley_plc_training.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wugituvunajobi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.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_off00005a78.bin
deaacdf214d29bc331e7fc905680960cf868a4028bf323ee7d1b803b8070a1b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A78 6004 bytes
font_01_sfnt_off00006ed0.bin
5b6da0a0fc394b4bf99bb6eaaeb1b7968f227876b7b7034f0e699c52e13aca05
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 12008 bytes