Malicious PDF — malware analysis report

Static analysis result for SHA-256 05328dd53713ff3e…

MALICIOUS

PDF

79.4 KB Created: 2020-07-23 21:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f12e41a8653b61dacf3da4ff22db8fe SHA-1: 5817fba7c33da66c8836c539348dd7ba9ca47c13 SHA-256: 05328dd53713ff3e083424760d239183c1b85e373f18eab186f45c4788a70d42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to redirector infrastructure, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. The primary malicious URL, 'https://ttraff.cc/pify?keyword=answer+key+2016+upsc+prelims+paper+2', is likely used to redirect users to malicious content. The presence of embedded links and the overall structure suggest an attempt to exploit users through a phishing pretext.

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=answer+key+2016+upsc+prelims+paper+2
    • http://files.vmiengineering.com/uploads/1/3/1/3/131383823/mozon.pdf
    • http://files.davisvilledetailing.com/uploads/1/3/1/6/131637056/vuparulojibi.pdf
    • http://files.williamgladstoneimports.com/uploads/1/3/0/7/130738881/pipegudipofome-bidaxetametub-sigab-soxokurematuwog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9779/2420/files/fufopibolol.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/86873730295.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3143/files/zetevuzupuxopesatodowun.pdf
    • https://cdn.shopify.com/s/files/1/0430/0763/9711/files/21809401569.pdf
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/paxowaworaxisulupiwanofit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofes.pdf
    • https://cdn.shopify.com/s/files/1/0434/6216/4644/files/dazasovorovivojud.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/pijabusi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8665/files/zokasikaluzunatuti.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/26908773801.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/pamigiduza.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_off0000f172.bin
d45a03e4c9097690400e9ad8ac7c988fd2be8516b58c8f6b58d671f6afe8b47f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 5496 bytes
font_01_sfnt_off00010415.bin
4ef84a3748c2fe0a0c99d79cb3426e3ed64db19e32824c4891d6e7f117e2b1f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 13740 bytes

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