Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b98e1d238fcf946…

MALICIOUS

PDF

64.1 KB Created: 2020-08-06 21:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc5cd12d89388f4e8dddc9bfd82c55fb SHA-1: 5661a09cd6f214b5824b92867d8e4a5d819f966f SHA-256: 7b98e1d238fcf946fcec91a2d33fd01ba3152eba48e182ddd4a5c3abfc56f6ae
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=bootstrap+4.+3.+1+tutorial+pdf', leads to a link farm hosted on Shopify, as indicated by another critical heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users with a seemingly legitimate document to click a malicious URL.

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=bootstrap+4.+3.+1+tutorial+pdf
    • http://files.birchbrookmanor.com/uploads/1/3/1/4/131437174/e3010206e.pdf
    • http://files.mpbanners.com.au/uploads/1/3/1/3/131381055/f2ad0fcc8b790c.pdf
    • http://files.enhanceosteopathy.com.au/uploads/1/3/1/4/131438113/887fe7d2.pdf
    • http://files.sunsetforhope.org/uploads/1/3/2/7/132740804/40da7719bc57d.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/52458724628.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/fokitosif.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/12525612942.pdf
    • https://cdn.shopify.com/s/files/1/0430/9945/5642/files/38267661642.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/naming_alkyl_halides_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0436/0981/7251/files/bacterial_protein_secretion_systems.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/72189148442.pdf
    • https://cdn.shopify.com/s/files/1/0436/2862/6080/files/zetetukekisopuvevepusix.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/91119473637.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/wotamimokag.pdf
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/kejojovuvawotojalejaxewu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/sonesafubapupopo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4280/files/woxetavilirolesobi.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad9b.bin
0e648df69f55099ebe1698549e634f2fe7b5f2c934282be93900ff63353ca552		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9B 5420 bytes
font_01_sfnt_off0000c027.bin
b2c307adca7ab81800c682e3680cf3a52a0686c33f74395b90ff8f577c827ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 16124 bytes

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