Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b50bd27511e74b3…

MALICIOUS

PDF

40.8 KB Created: 2020-08-28 05:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec1c0a992a9c32e46f0965c7404a406c SHA-1: cc02e4f296abc7944d3721920f4c47739ddecf9f SHA-256: 8b50bd27511e74b39e1adcc1903c4958851fa05701e1b31b496cf6233acd986c
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to Shopify-hosted PDF files, likely for SEO manipulation or to host malicious content. One URL, https://ttraff.com/pify?keyword=pomme+de+touline+4+brins, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests an attempt to lead the user to a harmful site.

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.com/pify?keyword=pomme+de+touline+4+brins
    • http://mowezeg.roseandfernart.com/uploads/1/3/1/4/131407995/3a0dc1cfd669.pdf
    • http://files.blankslatecoffee.com/uploads/1/3/0/7/130775228/polojebob-zisarebok-dusodu-fusurubajal.pdf
    • http://files.noexcusesbrandshop.com/uploads/1/3/0/8/130874585/ropekixoteno_sewumaf_ropob_sizasodesifug.pdf
    • http://mozom.margieburketours.com/uploads/1/3/0/8/130873790/bizeduves.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/composition_centsimale.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/wokowitevepigujuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/4649/2565/files/18102686098.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/agenda_de_boda_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5258/9465/files/jiwelev.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/isometric_grid_template.pdf
    • https://cdn.shopify.com/s/files/1/0468/0967/7978/files/podojoxorarigomidisimiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37629755229.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/xemurolejek.pdf
    • https://cdn.shopify.com/s/files/1/0463/1029/3669/files/certificate_template_for_students.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_off0000600a.bin
4d0f5f4d154f96cb362d3a3654391d9a252a8f116aaf633c8cee10ecadf0d030
pdf-font-stream PDF embedded font (sfnt) at offset 0x600A 4988 bytes
font_01_sfnt_off000070ec.bin
a0e50bd83dea1ad505fc91129c70658efbb3e50e530ae81685afb6a64241686c
pdf-font-stream PDF embedded font (sfnt) at offset 0x70EC 11540 bytes