Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9d59d0e8368abc…

MALICIOUS

PDF

56.2 KB Created: 2020-08-11 12:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc59529a5c1c2de7e10a7757db6f2398 SHA-1: d0a9c77cf21d46c803f15339d8cc8066adf33c5f SHA-256: 2b9d59d0e8368abc78808504bb8d3be76c75f84fbf6ef8af05f64618dd56d951
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=canonical+partition+function+pdf, which is a known malicious redirector. The presence of numerous links to external PDFs, many hosted on benign platforms like Shopify but likely serving as part of a link farm, further supports the attack pattern of luring users to potentially harmful content.

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=canonical+partition+function+pdf
    • http://vowagom.karencougan.com/uploads/1/3/0/8/130814423/1919031.pdf
    • http://fomeboxu.lucyhdelaney.com/uploads/1/3/1/3/131383775/9111718.pdf
    • http://files.annishealinggarden.com.au/uploads/1/3/0/7/130776864/kuxafixogudaruwuje.pdf
    • http://renanu.alltheriversintheworld.com/uploads/1/3/1/6/131636725/pilugataje.pdf
    • http://files.niagarakettlebellsportopen.com/uploads/1/3/1/4/131437862/8964665.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/nidesosesirusepeboso.pdf
    • https://cdn.shopify.com/s/files/1/0429/9096/0799/files/71327650571.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6165/files/12344733106.pdf
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/astral_projection_guidebook.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8526/files/68372824148.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8514/files/23538019628.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/tejilagopag.pdf
    • https://cdn.shopify.com/s/files/1/0438/6127/8870/files/91156746904.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3765/files/2728210736.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/nizifole.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/1889521433.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27347714529.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.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_off00008748.bin
c0524f1119f038fe3e8d4df17d73beac5bb49b6c5b0184a648bdabd1dbd0926a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8748 4876 bytes
font_01_sfnt_off000097e4.bin
5cf560780c8c87b05bfa0988476f71d12ed4c8f818add6dcdaa02adc7784fe22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E4 11072 bytes
font_02_sfnt_off0000bdfd.bin
4a49d8e5a932591095dffb690638fee85ea2044c56d39867fcdb65fe51a53c4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFD 16124 bytes

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