Malicious PDF — malware analysis report

Static analysis result for SHA-256 605bc64e083fee83…

MALICIOUS

PDF

42.7 KB Created: 2020-08-24 23:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6130c9a5e5e29f2b0be8774b83de77ab SHA-1: d9e084fa83925ad936f1a3d37ed1dd5f03d7dd4c SHA-256: 605bc64e083fee83b6fadf333b981fb4c4657a561c30d3b8ff256d8c3ec17ec7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, including one pointing to a known malicious redirector at `https://ttraff.ru/pify?keyword=impuesto+alcabala+pdf`. The document body, though heavily obfuscated, appears to contain similar links and references to tax-related documents, suggesting a lure for phishing or scamming. 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.ru/pify?keyword=impuesto+alcabala+pdf
    • http://files.yizhixu.com/uploads/1/3/1/3/131398102/fisenizadak_redafex_mitutalojejid.pdf
    • http://files.herbalhealthandhealingarts.com/uploads/1/3/0/7/130776042/9519705.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/zokoruwelovedinewatimir.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/52182065543.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/pokizeluz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6660/6247/files/bikap.pdf
    • https://cdn.shopify.com/s/files/1/0430/7507/6258/files/sukuzeroxapenusoran.pdf
    • https://cdn.shopify.com/s/files/1/0463/0675/4717/files/gugibulaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/50984803868.pdf
    • https://cdn.shopify.com/s/files/1/0430/0544/4259/files/25464796073.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/driver_evaluation_form_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/5975/7734/files/boojum_menu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/adding_integers_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0447/5482/9463/files/apostasy_in_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2709/files/gabriel_s_oboe_flute_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/fejaluzulimojomatezimolap.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_off00006698.bin
5920e8bed741ce4a254f77039fd7f51ab52416a698dd8c72f318a9c5836f977b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6698 5280 bytes
font_01_sfnt_off00007870.bin
8207d712ce6709a2f512ff2227197da6fec1d6b7f43f92bd7942a3cdb994e23d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7870 11636 bytes