Malicious PDF — malware analysis report

Static analysis result for SHA-256 225408c9f4d8011d…

MALICIOUS

PDF

40.3 KB Created: 2020-08-21 07:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2410b4bf98246a58e0f7cf614b11107f SHA-1: c91cfa1033e35b576ae262ea52e0ff3e2a97673c SHA-256: 225408c9f4d8011dcf6f9c0c865b5df98bcf2077c0330c1cb36a300c030f9111
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 'https://ttraff.cc/pify?keyword=vidmate++uptodown+new+version'. This URL is likely used to redirect users to a malicious site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector URL and the link farm structure strongly suggest a phishing or malware distribution attempt.

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=vidmate++uptodown+new+version
    • http://files.chrisdreliszak.com/uploads/1/3/0/9/130969368/fe8d11a1d3a975.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/67540957433.pdf
    • https://cdn.shopify.com/s/files/1/0428/1614/3526/files/emulation_vs_simulation.pdf
    • https://cdn.shopify.com/s/files/1/0440/3753/7942/files/biosocial_theory_dbt.pdf
    • https://cdn.shopify.com/s/files/1/0431/8806/0321/files/destiny_ddos_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/pumpkinhead_blood_feud.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/zilujojedofik.pdf
    • https://cdn.shopify.com/s/files/1/0436/0519/6957/files/rojutuganulomoxike.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/definicion_de_contaminacion_ambiental_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/12494747168.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vofekofunore.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5749/files/magnetism_physics_lab_report.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_off000055d2.bin
e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55D2 2952 bytes
font_01_sfnt_off00006060.bin
b5cdc43f5402287de98d1731dff7e71e6f873ddfeb72713d6bb3058e23f24bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6060 5192 bytes
font_02_sfnt_off00007201.bin
be4771bdacf603c35b754ee9787aa5fa0f37fe385ea9c3b2fc16cc2848ee96e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7201 9980 bytes

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