Malicious PDF — malware analysis report

Static analysis result for SHA-256 613bedfc77a545a4…

MALICIOUS

PDF

46.4 KB Created: 2020-08-08 04:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba4a8b0cdee3e7b5b5c070607c39a42 SHA-1: e39f4dad59196c71fdda9b00129055a93f7faea6 SHA-256: 613bedfc77a545a4d85870b4d135375d48d73472fda28cb17a7beb24eec0ffbf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to what appears to be a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.ru/pify?keyword=o+positive+blood+type+diet+food+list+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to drive traffic to malicious or spam-related sites.

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=o+positive+blood+type+diet+food+list+pdf
    • http://files.kahaboutique.com/uploads/1/3/0/8/130814758/d3913f110297095.pdf
    • http://wiretonu.rebootdiscgolf.com/uploads/1/3/1/3/131383791/wowebeponef.pdf
    • http://fofufepo.successfulthinkingmindset.com/uploads/1/3/0/9/130969742/gixavujenami.pdf
    • http://files.myhackney.org/uploads/1/3/0/8/130813588/79283d41d3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8757/5705/files/53009569312.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/rijewadidimitaraxikuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/understanding_comics_chapter_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0807/files/64324721272.pdf
    • https://cdn.shopify.com/s/files/1/0437/7722/8957/files/18150985478.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0918/files/29529825588.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/59192511993.pdf
    • https://cdn.shopify.com/s/files/1/0433/5730/7039/files/8855877686.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/aspects_of_development.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/joxepexekipono.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/34180261135.pdf
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/chiaro_corso_di_italiano_a2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007320.bin
2cda80479b4f441b594ea97c6322f342a1e160419ad26bfeb3df04a6a7b645c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7320 5060 bytes
font_01_sfnt_off0000846e.bin
995d6455c0ca666a6c1be40458345f841c5ff4e5558fc3fbeedc0373925b3d00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x846E 12668 bytes

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