Malicious PDF — malware analysis report

Static analysis result for SHA-256 65117e22b7ac1fc7…

MALICIOUS

PDF

49.2 KB Created: 2020-08-14 13:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccb9af861d54899d66aca550ae117332 SHA-1: c11a945e6920bfd7bafef2857d17c0aaf78958ae SHA-256: 65117e22b7ac1fc79d7d3dd6ed62c727068c634efbb11285faf5817a15c0c092
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://ttraff.ru/pify?keyword=kalender+2019+mit+feiertagen+baden+w%25C3%25BCrttemberg+pdf', is flagged as a malicious redirector. The document body, though heavily garbled, contains this same URL, indicating its likely purpose is to redirect the user to malicious content. 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=kalender+2019+mit+feiertagen+baden+w%25C3%25BCrttemberg+pdf
    • http://files.carfagnocleaning.com/uploads/1/3/2/8/132813998/ed4af92f72.pdf
    • http://files.foodbanknca.com/uploads/1/3/0/7/130775196/mubajox.pdf
    • http://files.merraephotography.com/uploads/1/3/1/3/131380146/zugudofibosolos-lavovebevudoni-dedelatak.pdf
    • http://files.saskiab.com/uploads/1/3/0/7/130740524/b5b8f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/bsc_zoology_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/66327176047.pdf
    • https://cdn.shopify.com/s/files/1/0435/7757/3535/files/zonowurimobuvedeweki.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/tizefogadejoxipeta.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/xivisawil.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/mathematics_formula_for_bank_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4661/files/zatosudig.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/32777220493.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0093/files/wetewiwawefo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8381/files/74252320543.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/nemexe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/wuvazebe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/wofukoletuximowawem.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_off00007252.bin
7d0bbd32338fba0b96828725455a9206329ccc0aed50fa89d2bda8cdc1e45b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7252 5984 bytes
font_01_sfnt_off00008680.bin
2dd580416762517851b84036216a17be93efd1590d32c127a5aee58de97855fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8680 15364 bytes

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