Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da5c74bc9116c66…

MALICIOUS

PDF

41.9 KB Created: 2020-08-18 17:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a338544b78da878a98c22933483fe28 SHA-1: 36cffe3be5e2e2c4d7337283cb632fc89345c33c SHA-256: 0da5c74bc9116c6666a86edf074201022c7893efbd26ef8f2437b20c7b01a3cc
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 manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=outlook+2016+archive+emails+manually', is flagged as a malicious redirector, indicating an attempt to lead the user to harmful 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=outlook+2016+archive+emails+manually
    • http://files.investinspections.com/uploads/1/3/1/4/131453436/95e1db2c299.pdf
    • http://files.duransrxsquare.com/uploads/1/3/0/7/130739480/02b547b9e1.pdf
    • http://biboxor.beautifulimageofboone.com/uploads/1/3/1/6/131637728/14f10cc19e10f6.pdf
    • http://rukera.pinelakemanor.com/uploads/1/3/1/3/131380005/wobujo-luzixu-rizuzinusagisu.pdf
    • http://files.sofialemann.com/uploads/1/3/0/7/130738548/fimawijuwusivogax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7879/4917/files/hollywood_reporter_cinematographers_roundtable_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/gozowafamelutedojasuzad.pdf
    • https://cdn.shopify.com/s/files/1/0434/9214/7366/files/loxud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/24278860480.pdf
    • https://cdn.shopify.com/s/files/1/0433/7231/4778/files/fetomexatotitajumoverir.pdf
    • https://cdn.shopify.com/s/files/1/0438/2654/4802/files/cartesian_philosophy.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/25547069732.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/74063910867.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6202/files/vegorede.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9288/files/14878006136.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7784/files/ffxiv_house_purchase_timer.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_off00006513.bin
9f1d0dd44f18f657482cdf141f719cc7ae9771d4d8256b979babd47d3bbd94c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 5772 bytes
font_01_sfnt_off00007897.bin
76149ab2bf9427e775f26c3196cc3c305a827ad490ff2d221992d2af2d931e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7897 10012 bytes

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