Malicious PDF — malware analysis report

Static analysis result for SHA-256 2130e87ea5647bef…

MALICIOUS

PDF

35.8 KB Created: 2020-08-08 20:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28e70580dbbce4e9fd36d19ea7148726 SHA-1: d5e21eed27e7f9f81d5b3747d2e95f5705810645 SHA-256: 2130e87ea5647bef80bc87a339f0885b03778ece2a5738aad0db1d94acd56949
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=past+simple+vs+present+perfect+exercises+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to malicious sites. No scripts were extracted, and the PDF structure itself is not inherently malicious beyond the embedded links.

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=past+simple+vs+present+perfect+exercises+pdf
    • http://files.womensselfdefenseftmyers.com/uploads/1/3/1/3/131380440/jalejo.pdf
    • http://files.srflasvegas.org/uploads/1/3/1/4/131438418/5166391.pdf
    • http://satowiwef.robyntillman.com/uploads/1/3/1/6/131606875/jitikazixipoxa_surujimigi_tikuridoto.pdf
    • http://files.nikesitesummit.net/uploads/1/3/1/4/131453648/20a3b68.pdf
    • http://files.lorraineparishuptowndowntown.com/uploads/1/3/0/7/130738748/defiguzamilafa-gunirodif-suziwi-dosasakeveva.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/26140577955.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/wafamapidijolivaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/sejarah_kota_tua_jakarta.pdf
    • https://cdn.shopify.com/s/files/1/0432/3275/5875/files/juwevobefetafeduvirurebej.pdf
    • https://cdn.shopify.com/s/files/1/0437/7526/2869/files/1996_ford_f350.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1077/files/86394525463.pdf
    • https://cdn.shopify.com/s/files/1/0429/1834/6915/files/epilepsy_action_plan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0469/files/35081757551.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/19650544162.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/5600031.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_off00004de7.bin
99f96cebd59916803dccc002c79a89b88077062519abae47d160ca6459388c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE7 5428 bytes
font_01_sfnt_off0000604f.bin
a6cf4217cb90dace9b3f42513d258fe8a24a7ced0c0d5c9d59dd4388a77766d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 9948 bytes

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