Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadc6ff6b180fce9…

MALICIOUS

PDF

47.0 KB Created: 2020-08-08 11:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e65444830ae32f6375ece9356a66ea88 SHA-1: 0a831b5665083b9422b4c8ee49c0597e3fb817ec SHA-256: cadc6ff6b180fce90b06ece4e862908448753bba75d00a12e51fa4b9b694a881
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL and references to a 'free astronomy magazine 2020 pdf', indicating a lure. The PDF also exhibits a link farm behavior, with numerous embedded URLs, many hosted on Shopify, suggesting an attempt to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=free+astronomy+magazine+2020+pdf
    • http://files.sciencebrewer.org/uploads/1/3/1/1/131163705/sojipelifew.pdf
    • http://files.madartdesigns.com/uploads/1/3/1/0/131070294/jeluxululap_patadedapexe_mefakuv.pdf
    • http://files.lavielashbar.com/uploads/1/3/1/8/131871633/2101171.pdf
    • http://files.mooneevalleymagazine.com.au/uploads/1/3/1/3/131378816/jowum.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2645/files/java_method_default_value.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6870/files/21407354061.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/golagetenifimire.pdf
    • https://cdn.shopify.com/s/files/1/0438/8726/3899/files/97866607319.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3979/files/wipetixutorofofawivibig.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/32095953246.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/27993350272.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/gepisivezotugofop.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/cassation_decision_volume_13.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/best_barbarian_build_diablo_3.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_off00006c01.bin
3fc11947411b8331a83c77f82b77d995332d376a68decbb13d66a8289ddf6cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C01 5500 bytes
font_01_sfnt_off00007ea6.bin
555a5d773cc1e57f990b8eff7d941bacfec7750227db451271363187297730fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA6 9996 bytes
font_02_sfnt_off0000a0e7.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E7 4324 bytes

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