Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ad393e5c73d4b3…

MALICIOUS

PDF

33.0 KB Created: 2020-08-11 05:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6da7a353c5b39a0dda4db8d7360047f SHA-1: cfbf4ba8d8bacb98525a0cd1a319cd66cd149260 SHA-256: 76ad393e5c73d4b378655aa180700cc19de9da980733b544ab05fcab474098fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'CCNA lab manual PDF 2020'. The presence of numerous links, including to potentially malicious infrastructure, suggests an attempt to drive traffic to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=ccna+lab+manual+pdf+2020
    • http://files.wicknsudsbydino.com/uploads/1/3/0/8/130814121/josijigubajuxefob.pdf
    • http://files.kskydonner.com/uploads/1/3/1/6/131607131/wedagazumexagexatit.pdf
    • http://sazubu.kimdavenportread.com/uploads/1/3/1/3/131379312/vikanafos_xisexolefelu_vidafizon_lirososuxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/18_wheels_of_steel_haulin_mod.pdf
    • https://cdn.shopify.com/s/files/1/0438/3113/2322/files/kickass_torrent_proxy.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/kenem.pdf
    • https://cdn.shopify.com/s/files/1/0435/3081/3592/files/kudupipigenosivuligizekoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/dewoluwewugupebepawefad.pdf
    • https://cdn.shopify.com/s/files/1/0435/3435/2548/files/zikowirasaxugulukitas.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/mozimuzozixutawivoziwuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/ketome.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/ventral_hernia_patient_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/jogatakenevivamunis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/1935476307.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043a0.bin
70fd103049858335f27fdf5d3f6e8265a50687e9f10a61b0f81d434379410487
pdf-font-stream PDF embedded font (sfnt) at offset 0x43A0 5344 bytes
font_01_sfnt_off000055ad.bin
d288afa014c7b21c4a9bfeee843d0bf7a4282b57a4736f29ad831bead8d13421
pdf-font-stream PDF embedded font (sfnt) at offset 0x55AD 9856 bytes