Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2bfe3c3c844484…

MALICIOUS

PDF

58.9 KB Created: 2020-08-02 21:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4af6d700028b2ab3ba13511080d9619 SHA-1: 859be06fd0e72faca6a7da559a26028784a5fa9b SHA-256: 3e2bfe3c3c84448447396b0dafddc88c2fcb52a521d0ed619f91e5ffca43147a
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to potentially malicious redirectors. One such link, https://ttraff.ru/pify?keyword=fl+studio+11+producer+edition, is explicitly flagged as malicious. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to trick the user into visiting a malicious site by masquerading as a software download. No scripts were extracted from this sample.

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=fl+studio+11+producer+edition
    • http://files.spcwaterdistrict.com/uploads/1/3/1/6/131637271/kesatatamokaxoji.pdf
    • http://files.spadeesperanza.com/uploads/1/3/1/3/131398547/6669510.pdf
    • http://files.springhillartscenter.org/uploads/1/3/1/3/131379894/fugepuv.pdf
    • http://files.cbcaustralind.com/uploads/1/3/2/7/132740925/4903627.pdf
    • http://files.daphnehocakedesign.com/uploads/1/3/0/7/130739789/wamuzapojupaxeworupo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/tamonug.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/91826686392.pdf
    • https://cdn.shopify.com/s/files/1/0437/4118/4165/files/nickelback_burn_it_to_the_ground_explicit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0942/files/logupetitalegasixexivoni.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/70199211751.pdf
    • https://cdn.shopify.com/s/files/1/0431/7334/7488/files/45961158026.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/vujagopevixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/lofadimenegim.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7612/files/91533656945.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/wodamanunodafipusanulor.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5333/files/dexuriteto.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/mathita_dvd_ram.pdf
    • https://cdn.shopify.com/s/files/1/0440/6640/6550/files/74018224975.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_off0000a989.bin
8d709b6d61fe8649d4b8a3ab08115b33d7c9c1dc2314af447507a68e9f777228		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA989 4864 bytes
font_01_sfnt_off0000ba2b.bin
a98ec8013e4e139edc434c9f652a9b9efb6ef802495568b964c21353405598ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2B 10592 bytes

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