Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98dca3e19e9c801…

MALICIOUS

PDF

68.3 KB Created: 2020-07-27 21:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3ca34e10b2313bf95239763ea7d3c35 SHA-1: 49ee09c62ce67e30d7af902f8c8fdc8c61f72591 SHA-256: d98dca3e19e9c801300353cedea751e3065f499410e20194e1746d4481c932f8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier and contains a large number of embedded links, many of which point to a redirector service. The presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and does not provide clear intent, but the heuristics strongly indicate a malicious redirection scheme.

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=timex+chronograph+manual
    • http://files.wayhomeproject.com/uploads/1/3/1/4/131437680/fasolipupowev.pdf
    • http://files.danklandsaga.com/uploads/1/3/1/4/131483197/8871806.pdf
    • http://files.honeyscider.co.uk/uploads/1/3/0/7/130776632/2277781.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/sosugiledezarogidikinov.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/13375774081.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4093/files/pumatafaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/veromuzejatenitato.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/rinoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8260/files/nixabumemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3943/files/jerama.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8713/files/41415995680.pdf
    • https://cdn.shopify.com/s/files/1/0431/5021/3274/files/laporig.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/tojazus.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/juzagekupakavewadefo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8726/3899/files/10914358738.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3857/files/xufebesunuse.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/
    • https://cdn.shopify.com/s/fi

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a03c.bin
4d52d158014fa9607e5f12c54812d82ae9f1755b01a49d7176c0530f25cbc63e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03C 4988 bytes
font_01_sfnt_off0000b100.bin
c25d5b996f55be8d498a4c1f16f096d7a5feaa4573313827901db4810bdd79dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 21720 bytes
font_02_sfnt_off0000d304.bin
c43f8960fe769e6eb6e7a5358a5e8c62b1fca43decabc670cc79197a306ddb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 2540 bytes
font_03_sfnt_off0000dda6.bin
f2f42889b414d5b7c20af5daeaaea6cc2f21ccd3b43186cbfb80db280228d84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 10824 bytes

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