Malicious PDF — malware analysis report

Static analysis result for SHA-256 19330bd77f36f56e…

MALICIOUS

PDF

52.8 KB Created: 2020-08-01 21:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bffacc583732ad2499663e3ef52e18de SHA-1: 648bdc3f5c389abbfae524a9e587a5f9e9ae829d SHA-256: 19330bd77f36f56e2d0e9f3cea42776f4162a99c4373cccd5d8ff7a461ad9969
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a malicious redirector, which is further supported by the presence of a large number of external PDF links. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm. 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.cc/pify?keyword=python+object+oriented+programming+exercises
    • http://files.puddlesandrainbows.org/uploads/1/3/1/4/131408209/e4618981.pdf
    • http://files.soullightcollage.com/uploads/1/3/1/8/131857305/6402669.pdf
    • http://files.pinegrovecogop.org/uploads/1/3/0/8/130874318/de351d21ce3806f.pdf
    • http://files.tropicalduckies.com/uploads/1/3/1/0/131070508/4ea6904605e1.pdf
    • http://files.nodaysoffalthletics.com/uploads/1/3/1/1/131164122/3225b1fc94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/tetutopasinibemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/balateje.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7848/files/wujajarimakasilipifa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8912/files/sovazodujuvizebiteburu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/7511922833.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5589/files/ropopinetumomanudogovo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/tirokel.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/86816378359.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/11403722180.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/74924800761.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/neretidesalefadim.pdf
    • https://cdn.shopify.com/s/files/1/0437/2394/8183/files/jefusinutalazod.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/12573960155.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_off00007e02.bin
c9c308a322ee560fa0d61911e5f36d0cf817a67f9aad71a84273030fcb5a6afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E02 5840 bytes
font_01_sfnt_off000091c7.bin
56ef7519217cf7063b6a7de78a97c36bdea6d95a83df87c95e88b016dcee53bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C7 15836 bytes

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