Malicious PDF — malware analysis report

Static analysis result for SHA-256 690ebfcda4e2345d…

MALICIOUS

PDF

45.6 KB Created: 2020-08-03 14:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0543dabd177393f6a3ad533e6d4c8ec3 SHA-1: 7513890e668b9bc8eb4a85b44016d2c2c204ff32 SHA-256: 690ebfcda4e2345dff5ef8cc594a74604710bcb683bd7ce40daa3a563fd16608
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary link directing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=macbeth+revision+notes+pdf', suggesting a lure to disguise malicious activity. 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=macbeth+revision+notes+pdf
    • http://files.monumentalconcreteworks.com/uploads/1/3/2/7/132712661/6152066.pdf
    • http://files.caseykinseyart.com/uploads/1/3/1/4/131453934/1541826.pdf
    • http://files.bodyprose.com/uploads/1/3/1/8/131856134/39914ce2be.pdf
    • http://files.webelievefoundation.net/uploads/1/3/2/6/132681694/5e603038c2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/4895/0170/files/sususopatuwuvopunewajibez.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/50464054777.pdf
    • https://cdn.shopify.com/s/files/1/0440/0214/8510/files/adobe_reader_linux.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/vunoxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/zanoku.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/simibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/dapagafavawupid.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3413/files/us_bank_holidays_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5507/0880/files/jedizirekaforewifuluwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4940/files/fazajoxepuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/92976578398.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38804475130.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/pumelolukitugef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006880.bin
a1e8d3b1909bcdfe957ec5e27083ff573aeabd2ed5bd7896cfeb96cc6b40a19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6880 5204 bytes
font_01_sfnt_off00007a22.bin
f98d2aed2e44412ab51bf6168d8242acc5a4d74c7bc4ba02ba962f4e98306711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A22 9708 bytes
font_02_sfnt_off00009b46.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B46 4324 bytes

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