Malicious PDF — malware analysis report

Static analysis result for SHA-256 16df1ad8b7d7109f…

MALICIOUS

PDF

48.7 KB Created: 2020-08-31 12:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63b431579b240953a0057d484998e79c SHA-1: 86e256d54a33a95b89c2cac617f60435f54f5fde SHA-256: 16df1ad8b7d7109f6dabdc0727777e2ed1d9999032cccc44219f7c325ef7e1bb
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link leading to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for an audiobook search, which is then linked to a malicious URL. 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.com/wix?keyword=only+the+paranoid+survive+audiobook
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/eaf48f_8273edd84237486b9df68f8bf3461cb7.pdf
    • https://static.usrfiles.com/ugd/6116da_0faa74e83ac84144a7bf04be4af5ed36.pdf
    • https://static.usrfiles.com/ugd/69695d_79cb6d62466f4fdfa88285031d377eed.pdf
    • https://static.usrfiles.com/ugd/2e79a6_0b8ff3b51f3d452c858aa39015bfdcce.pdf
    • https://static.usrfiles.com/ugd/b8c837_585e8478dc684b0b9b27ade8e9e7a858.pdf
    • https://static.usrfiles.com/ugd/e6092c_c17b8a96e9a64075946da23c127a66fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_04040f7608d74a0495fb67801fd37b0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f676f4ff3d146058fef31fa5db7fc70.pdf
    • https://static.usrfiles.com/ugd/238140_1e9cef049ae64ffd987f90fb094c111b.pdf
    • https://static.usrfiles.com/ugd/cf14a4_49ea903992a14f15b9df2a506e039ef0.pdf
    • https://static.usrfiles.com/ugd/9e53d4_8926b3a3815d4ecabc0a9c1b2bbe7b00.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3277/files/19533769301.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/52159640283.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4700/files/69797964041.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/deadpool_kills_the_marvel_universe_1_4_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/33699123677.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_off000072b7.bin
f728dfcaee06dd604e09eb91edd763042707e4ba84c694114f6f5788c9ce1134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B7 5324 bytes
font_01_sfnt_off000084c0.bin
88b92e1ae057c5c068dd58c04f35e6c5c614309ef3e79f374e2f96b2d108ecb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C0 10260 bytes
font_02_sfnt_off0000a7da.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DA 4324 bytes

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