Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcb80a37fd7b644…

MALICIOUS

PDF

40.9 KB Created: 2020-08-28 06:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4e02e4bebdf62091133b5ccfff0caba SHA-1: e0385042adda46120241d99b1973fa91f0125403 SHA-256: cdcb80a37fd7b64417657cc9def12c874ab7d862df21481cb389d384b72f0ee9
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 of which are hosted on Shopify but also include a critical link to a known malicious redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains the same title as the malicious redirector URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=awards+ceremony+slideshow+after+effe
    • http://files.adambrackin.com/uploads/1/3/2/6/132681985/laxurodig.pdf
    • http://jururagoz.kevinwiczer-actingcoach.com/uploads/1/3/1/4/131483152/4543375.pdf
    • http://files.smoothpool.com/uploads/1/3/2/6/132682829/kozefifajejelib-jiradirasesav-mufemisi-ziwakaworelaku.pdf
    • http://files.spectrumoilfieldsupplies.com/uploads/1/3/1/8/131871786/6b1df64a.pdf
    • http://xuvopifa.thehockeyprofessor.org/uploads/1/3/0/8/130874426/lijulamuzo_dakow.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3707/files/the_middleboro_casebook.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/tiwowawumedezejuxowufiwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/bapawoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2245/files/molality_worksheet_13_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/gizizejoxasobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/wisesegiworul.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/bumoxixuta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/data_analysis_in_social_research.pdf
    • https://cdn.shopify.com/s/files/1/0432/2014/0191/files/88453074203.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_off00006107.bin
36e04b8ece90232df6077ce8174cd9aacd013c9f2cc3a24d285dd4b7e0de74d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6107 5444 bytes
font_01_sfnt_off00007365.bin
2fb3f8f68aaec69654330093f2270b8a58230907f29cfbf20bbd490fe045fc18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7365 10352 bytes

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