Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a0c5fbdc76edbc…

MALICIOUS

PDF

42.2 KB Created: 2020-08-21 15:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5b674737b5378a49e83bb5e133041c9 SHA-1: 1cd741fbbe30d6a3d99a09f6c2579bbcc1578df4 SHA-256: 40a0c5fbdc76edbc03670a2f8d194cda762117f0f3557cc43359d2e47a90d365
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to a URL associated with malicious activity. The document body text, though partially corrupted, mentions 'aac file editor for android' and includes the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=aac+file+editor+for+android
    • http://files.dlrconstructionco.com/uploads/1/3/0/7/130738741/genabumabexa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8725/5970/files/99626910452.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0437/6644/8277/files/map_iterator_c.pdf
    • https://cdn.shopify.com/s/files/1/0434/0642/6275/files/sasasosipite.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48880371243.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/conducta_normal_y_anormal_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0446/2352/8099/files/tovewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovutuku.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/canada_lottery_application_form_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/dowubulojeko.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9701/files/model_cerere_concediu_crestere_copil.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/politik_identitas_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/zafojifosivikugovama.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b3.bin
6bed0c3433bbe16f513bf32c890953b96549f97c3b475f5f3939e78084dcbe9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B3 4828 bytes
font_01_sfnt_off0000781e.bin
c6c9b7f0b2729b292d4084feb9ae7f309f1a1090a4cda7266ca6969737f6d43d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781E 10548 bytes

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