Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2e8f601230b187…

MALICIOUS

PDF

42.0 KB Created: 2020-08-08 17:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63a6d795f6eebd3c8f971b3574f3ad4 SHA-1: c3ba9a7fbe21514d50e90b923b014ecbc9956882 SHA-256: 9b2e8f601230b1873f07afefb3089cb1689635a96044783ac7a341163464415e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body and embedded URLs also indicate a link farm strategy, with many links pointing to Shopify domains, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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/pify?keyword=general+mathematics+textbook+pdf+grade+11
    • http://files.petrinka.com/uploads/1/3/1/4/131409200/fejekofijisekugobuna.pdf
    • http://files.dalesbus.org/uploads/1/3/1/0/131070651/9164126.pdf
    • http://files.eastwinchester.org/uploads/1/3/0/7/130776864/tonavonumavej_xobilonipadusu_kamijoze_guzalibotepa.pdf
    • http://files.aleafintheforest.com/uploads/1/3/1/0/131069869/nojur_gebesiwizoled_xogoti.pdf
    • http://files.wendimagegnbelete.com/uploads/1/3/2/6/132680901/4261046.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/raxufutasedibow.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/risorubovufuduworape.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/runiwonetu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2324/files/malaria_parasite_atlas.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/46872199974.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/ccna_security_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/15099216726.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/pitco_fryer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7363/3432/files/tatidoro.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/lippincott_nclex.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_off00006403.bin
13477459287749f9d0475960219480d16ee6ce4ea3b616a7b1e8b7933fb6f123
pdf-font-stream PDF embedded font (sfnt) at offset 0x6403 5924 bytes
font_01_sfnt_off0000780e.bin
967accfcfa89532ba9237ec20694deb53a1d29c5b7354aad6d97244cf29fb35e
pdf-font-stream PDF embedded font (sfnt) at offset 0x780E 10252 bytes