Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7e0a5861b00533…

MALICIOUS

PDF

44.0 KB Created: 2020-08-09 16:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72da69f11a67e76cb70daa6279dbe8cf SHA-1: a2a6a1247ab76e99f77f6766ec91895982536824 SHA-256: 5c7e0a5861b00533b191a6889bfc07441506cab1c92b61c059f3c32fc9683caa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to a redirector service. The primary malicious link, https://ttraff.ru/pify?keyword=athlean+x+bodyweight+workout+pdf, is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content under the guise of a workout PDF. The ML classifier strongly flagged this sample 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.ru/pify?keyword=athlean+x+bodyweight+workout+pdf
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdf
    • http://files.squirrelgazer.com/uploads/1/3/2/7/132740435/povoraxaga.pdf
    • http://juriza.masonjarstudio.ca/uploads/1/3/1/8/131872225/2b79f78c2.pdf
    • http://files.scentedgrove.com/uploads/1/3/1/4/131409037/f113746d3ce.pdf
    • http://files.ryanballonlineportfolio.com/uploads/1/3/0/8/130814515/fofesifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/70733816728.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/mevafida.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/lagipaba.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/keletezemapokojuwerer.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/velemokim.pdf
    • https://cdn.shopify.com/s/files/1/0432/2787/3440/files/sakedobizutapone.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/masupunejodebebilin.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/37856571393.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/24177757627.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/92747610277.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_off00006d32.bin
c9ecd48c6e9909df030fc58b45ed1cda992f281c939906f966fc980f73847c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D32 5580 bytes
font_01_sfnt_off00008049.bin
571ef50526b6920560603e065de1818ca8e4ec47cf46fb48b43e8e9de83bd591
pdf-font-stream PDF embedded font (sfnt) at offset 0x8049 10236 bytes