Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5374738086e795…

MALICIOUS

PDF

44.2 KB Created: 2020-08-19 10:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbfc2816a55f6fcdd9397bb594ea1010 SHA-1: d56377b87ed9851036bdf01295675aae793451c7 SHA-256: 4a5374738086e795a98de02bcfc967d6b4c6dded8982f96b4a41e360fc382d3f
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=cooperative+learning+strategies+in+the+classroom+pdf. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution. 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=cooperative+learning+strategies+in+the+classroom+pdf
    • http://zarug.fredoniapubliclibrary.org/uploads/1/3/0/7/130776099/248613.pdf
    • http://files.toymigos.com/uploads/1/3/0/7/130775970/fisuwikasexiguwid.pdf
    • http://files.midnightriderbrts.org/uploads/1/3/1/6/131637240/7013935.pdf
    • http://files.howtorentvacationhomes.com/uploads/1/3/1/6/131606864/6341182.pdf
    • https://cdn.shopify.com/s/files/1/0429/1503/7351/files/finusejolazan.pdf
    • https://cdn.shopify.com/s/files/1/0437/2040/9256/files/12485321755.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/book_cover_page_design_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4495/files/international_encyclopedia_of_political_science.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4104/files/29281220218.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/sawepa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/31394124035.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/tugebowovubije.pdf
    • https://cdn.shopify.com/s/files/1/0432/1669/9553/files/9728545520.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/model_free_adaptive_control_theory_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0430/6170/6903/files/ncte_approved_b._ed_colleges_in_haryana_list.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_off00006dd7.bin
adfbd30593dcb99d70f420c6731998d75bbe940b8d6de87e32f3bf3da83e846c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD7 5532 bytes
font_01_sfnt_off0000807f.bin
a9f506bfbf94de55f05fceede78c74a58c8f416e35f8bbfbe441f31251eb3f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x807F 10288 bytes

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