Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f64c1395eb973d…

MALICIOUS

PDF

34.9 KB Created: 2020-08-21 21:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 207ac5464fdbb6511002ce7f7d25ff82 SHA-1: 4c48b73ddc3dba61e3d38ef08152fa9162af3239 SHA-256: 78f64c1395eb973df360687ee8c09adfbae44acfeaff270914eb19fcb34f30b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc), indicating a malicious intent to redirect users to harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=kota+the+friend+birdie+song
    • http://files.hornehastingsgourmet.com/uploads/1/3/0/8/130873804/08f5a.pdf
    • http://files.jsprincessparties.com/uploads/1/3/0/9/130969522/9787866.pdf
    • http://files.rendonmediation.com/uploads/1/3/1/4/131408353/tovafozetudujujabute.pdf
    • http://vafilelar.amalgamatedstory.com/uploads/1/3/1/4/131453540/negegosalegofiwikud.pdf
    • http://dogilu.sailorstclaire.com/uploads/1/3/0/7/130776394/ramiri-begogokeperadid-nubisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/dumpper_wifi_hack_free_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0441/files/beauty_and_the_beast_broadway_script.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/wosederenuvobexezisatas.pdf
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/vunugevovunomediforur.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/82681060042.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/zufisulasonelufadetivisok.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/vaboradikuteredudexagag.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/bella_y_bestia_libro.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_off000048bb.bin
f85201bfbd1e35c3df7eeabca02766cb3e4be43d43c1d63754e13c3dc3538555
pdf-font-stream PDF embedded font (sfnt) at offset 0x48BB 5248 bytes
font_01_sfnt_off00005a92.bin
09fc65ffd680ce0f7fde3732b2e751b3405e71c83ee52414de0c0d170df27c91
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A92 10296 bytes