Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b4e3ce71c94f04…

MALICIOUS

PDF

46.2 KB Created: 2020-08-24 03:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e957eab8a7c724190909ff2b60b404a8 SHA-1: a88b7568438cb77cec567da7dae1c7fdab65fc99 SHA-256: 57b4e3ce71c94f043e5f3763d5cb2f8325d9d08066640727e44b3b0edd291d96
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a significant number of external links, many pointing to a link farm infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=intermediate+english+grammar+exercises+pdf, which likely serves as a redirector to further malicious content. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on various domains, suggesting a coordinated effort to distribute 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.ru/pify?keyword=intermediate+english+grammar+exercises+pdf
    • http://files.laneanimalhosp.com/uploads/1/3/1/6/131606408/murajaxosa_kalata_medazexoreraret_wibuvuweje.pdf
    • http://files.algebra-and-beyond.com/uploads/1/3/0/7/130739987/c28eb819a63f773.pdf
    • http://files.draytonparish.org/uploads/1/3/2/6/132695574/kovilefu.pdf
    • http://files.samosetband.com/uploads/1/3/1/3/131378975/rorokudadigaxuxik.pdf
    • http://buliwobif.theinkwelltheatre.org/uploads/1/3/1/6/131606552/fiduwuzisubipedo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/resurrection_of_f_subbed.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/complete_guitar_chords_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/neumonia_pediatria_elsevier.pdf
    • https://cdn.shopify.com/s/files/1/0434/2284/3036/files/wudeduvibizamut.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0288/files/55417421188.pdf
    • https://cdn.shopify.com/s/files/1/0436/0726/1341/files/veveduvisutamejisi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/80925989357.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/gevetelopa.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_off00005f4f.bin
0f21e36dd396a4fbaa04fe63f064a9fd1d388d63954f41255d69fc5030d0b1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4F 5576 bytes
font_01_sfnt_off00007216.bin
c9eb98e13de23030d7eaade623df3bbc4a926f59593c75f1cb551d066eda3b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7216 10288 bytes
font_02_sfnt_off00009545.bin
c27f923d842fcf75914bcb38f910c7ee9e5e847eea41e4b8197fd3b1a7c12a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9545 16508 bytes

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