Malicious PDF — malware analysis report

Static analysis result for SHA-256 14228b1bb9e970ea…

MALICIOUS

PDF

44.5 KB Created: 2020-08-21 13:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d31fac38be61e991851721a0fe6df8b4 SHA-1: de61daff147da6ef9059244906bc59a02afd2c76 SHA-256: 14228b1bb9e970ea837b58f8efaaacb72cb3ac8d38309ddd5d4d520cad328285
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a link farm hosted on Shopify, but one critical link redirects to `ttraff.ru`, identified as malicious redirector infrastructure. The document body, though obfuscated, contains the text 'Homework tracker spreadsheet' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of embedded links and the redirection to known malicious infrastructure strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=homework+tracker+spreadsheet
    • http://files.differentstrokes-painting.com/uploads/1/3/0/8/130873945/vodepozitimulawamiga.pdf
    • http://gowadufow.annamafchirart.com/uploads/1/3/1/4/131453858/eb9d03e076f9b38.pdf
    • http://navir.morganhgart.com/uploads/1/3/1/0/131070420/rotugodudiko.pdf
    • http://files.tarabooth.com/uploads/1/3/2/8/132815791/zefawova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0210/0899/files/67530204115.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/ap_biology_lab_1_osmosis_and_diffusion.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/90575037278.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/types_of_nanosensors.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4789/files/17899035419.pdf
    • https://cdn.shopify.com/s/files/1/0438/8074/3080/files/walter_benjamin_violencia.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/relakederoju.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/fagejow.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/kukulupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/abu_dhabi_investment_authority_annual_report_2016.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006421.bin
83581251631e1fbd28a10be2507690a5b293c76bd668aa5916f1afbf7b4861b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 5032 bytes
font_01_sfnt_off00007543.bin
0ebe78f6d6bea76b0a2496032164b3f41ad57a8d13909429d9c7ce55ef98bb7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7543 9892 bytes
font_02_sfnt_off00009723.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9723 4324 bytes

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