Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef4a72c1da63c0b…

MALICIOUS

PDF

62.7 KB Created: 2020-09-03 06:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b62f1782b1088375038558904cc75f3e SHA-1: 34edc5dbb012954f42988a5d792c31e1952b7a70 SHA-256: 0ef4a72c1da63c0b42ba4c779893aab8f6efc7d50ba31aaa36145700eeb09095
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a pub quiz and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests an attempt to lead the user to a harmful site.

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.link/wix?keyword=funny+pub+quiz+questions+and+answers+2013
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/dabirasifumuxelawif.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/butchers_choice_dog_food_feeding_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/zoxunakatixisode.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/29134493506.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/zutotajisulukegut.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_9ad8055327834532ab7108f3d9b7a206.pdf
    • https://static.usrfiles.com/ugd/9e53d4_d29f4637daff42e08a402569fc264f14.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_95f7dccd2a664e4cbd60cdc02a7e2239.pdf
    • https://static.usrfiles.com/ugd/88a84f_e7a6d0d4d9f445cc98b0ed1c6de69a78.pdf
    • https://static.usrfiles.com/ugd/1ebe14_8c8d5ed8cfc3410590209101e70842b6.pdf
    • https://static.usrfiles.com/ugd/a2d007_9877b724ad504ef99f4a8d4f64244ed4.pdf
    • https://static.usrfiles.com/ugd/5ed537_990572a7f5144cc6a1cefbfff196bc8a.pdf
    • https://static.usrfiles.com/ugd/0a593f_c7fd28df5e37429fa03f4c061eae8347.pdf
    • https://static.usrfiles.com/ugd/b910ae_25a8042e1b814b37a1494a1b142dd1e8.pdf
    • https://static.usrfiles.com/ugd/cc3ca9_a4fd7dde11364c3693a634b15a0b97e5.pdf
    • https://static.usrfiles.com/ugd/e66789_5719d371994f475f8ceaf83028c79f99.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_off0000b433.bin
eaf0ca66c2a370752981fc0670f105f074c9f6784272a334ab04d6261b0b82e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 5876 bytes
font_01_sfnt_off0000c85b.bin
85f7093a503c39c588f897752e07580e3c0f563967c46057b6af2e6be10d3258		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 10348 bytes

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