Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c960f15f908d1a…

MALICIOUS

PDF

37.7 KB Created: 2020-08-09 03:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a1897ed1349a4d255945d51977ed98 SHA-1: 0c500ca1b63cd655e08a0535f038f005b5a7d7f2 SHA-256: 50c960f15f908d1a8a65cdd05fd18756d178ac64d46eb3309d276c3e2d441719
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a critical heuristic due to a link to known malicious redirector infrastructure. Additionally, it contains a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to obscure the true destination or distribute content widely. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the URL 'https://ttraff.cc/pify?keyword=can+t+you+see+chords+pdf', which is a primary indicator of malicious intent.

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=can+t+you+see+chords+pdf
    • http://files.mckinneyquiltersguild.net/uploads/1/3/0/8/130814926/4958228.pdf
    • http://files.busterbledsoeband.com/uploads/1/3/1/4/131454286/5326988.pdf
    • http://files.dataethics.net/uploads/1/3/1/3/131381109/sivux-siparuzo-tefedal-zaxep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63032467643.pdf
    • https://cdn.shopify.com/s/files/1/0432/8921/5129/files/livre_d_algorithmique.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/napisogimusigat.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/katasekakesasemawe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/18988053223.pdf
    • https://cdn.shopify.com/s/files/1/0436/5464/3877/files/voxelavinijefof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/31315429799.pdf
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/zupisib.pdf
    • https://cdn.shopify.com/s/files/1/0431/2609/6036/files/velinepezup.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/4708060761.pdf
    • https://cdn.shopify.com/s/files/1/0433/9689/0785/files/ejercicios_clases_de_sustantivos_4_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/difference_between_isothermal_and_adiabatic_process.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_off000049b8.bin
101f28ecb28c52fc2a574a8a2313a08e019012c231a99e57ded83987baaefbf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49B8 5168 bytes
font_01_sfnt_off00005b4e.bin
4a1051b6747d3da3ec3dccdc484157ce6f30a01c15ed2b43b45979c9007c9af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4E 9584 bytes
font_02_sfnt_off00007c26.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C26 4324 bytes

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