Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4cf43907ff4685…

MALICIOUS

PDF

49.0 KB Created: 2020-08-31 01:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8617e2fe608b59ac76741525a4ac42f SHA-1: b812629edb51ebff1078c2ee2b12ca9075141bce SHA-256: 0c4cf43907ff46851bd8410e2dd322ffc0e70feb6f1c3575407b56b9ab27e5c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.me'. It also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'congruent triangles'. The primary attack vector is likely spearphishing attachment, leading to a redirector that may host further malicious 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.me/wix?keyword=congruent+triangles+snowflake+activi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/thyroid_disease_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6225/files/70368085213.pdf
    • https://cdn.shopify.com/s/files/1/0431/3959/6454/files/65733000944.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/weroson.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/cutting_edge_third_edition_upper_intermediate_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/nnpc_aptitude_test_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9601/files/33044973190.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/add_text_to_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2732/4310/files/15023897168.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/meparimuvogevenatolux.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/after_effects_the_power_of_expression_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0437/7185/5002/files/css_center_text_vertically.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ff.bin
a332883b9c806f128ba58dccc7292032954f6f8026e594616ac29438d98930b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FF 5168 bytes
font_01_sfnt_off000074b8.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 1800 bytes
font_02_sfnt_off00007d45.bin
8141cacb03bf3a4ccba5058e4b60ac135b14f7a0485869df395a5c1eae9484cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D45 10392 bytes
font_03_sfnt_off0000a0f7.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F7 16312 bytes

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