Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b76d3196517650c…

MALICIOUS

PDF

40.5 KB Created: 2020-08-03 23:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd39dba42d3edce489065b965ac6077c SHA-1: 78f864db7aef23ac6a67950b2c342145a97da917 SHA-256: 4b76d3196517650c2351970be0d1ad60c7bbb1b27ed50a95ce086147d6827afe
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains references to the redirector URL and other Shopify links, reinforcing the link farm attack pattern. No scripts were extracted from this sample.

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/pify?keyword=adobe+animate+cc+2020+keyboard+shortcuts+pdf
    • http://files.brainchildlangley.ca/uploads/1/3/1/8/131856706/lurug_sisomifaw_savikonizilixob.pdf
    • http://files.neighbors4christ.org/uploads/1/3/0/8/130874489/1c31274.pdf
    • http://files.ucporegon.org/uploads/1/3/2/6/132682627/waxazutonakezanep.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/87819962781.pdf
    • https://cdn.shopify.com/s/files/1/0434/2844/6358/files/73504216690.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/55316031998.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/63419285913.pdf
    • https://cdn.shopify.com/s/files/1/0435/4415/0165/files/marvel_captain_america_comics.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/craigslist_denver_gigs.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/39188952025.pdf
    • https://cdn.shopify.com/s/files/1/0435/5755/2277/files/the_official_guide_to_the_toefl_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/ikea_table_tops.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/21679874395.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sasukeseduvemuledup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005010.bin
5f02e8924fc7f9b00cbd858032998422d75d3e52dbe0823b6a9fb520e119d116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5010 5812 bytes
font_01_sfnt_off000063b0.bin
25d996667e5384572d07475503d1f427e891bf9075152a5fd6808c53493fd3c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B0 10244 bytes
font_02_sfnt_off000086c9.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C9 4324 bytes

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