Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a06e02b068894e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-03 14:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4763a93c7f8f60ee8cf96e35af84922 SHA-1: 4f04a62c6dd43aa19fb8f84f3927c80743d114ae SHA-256: e5a06e02b068894e90c2adb4966be6963696aba26a990b49a1b3ef92e2ed4aac
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to a malicious site or download further payloads. The document body is obfuscated but contains references to 'addition word problems for grade 4 pdf', suggesting a lure to disguise the malicious intent. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm or SEO poisoning technique to increase visibility and traffic to the malicious redirector.

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=addition+word+problems+for+grade+4+pdf
    • http://files.superiorsupportsrvs.com/uploads/1/3/1/0/131071252/3969d7d0bb325f9.pdf
    • http://files.valeriaflorescano.net/uploads/1/3/2/3/132303310/ae6dfe.pdf
    • http://files.jenniferbundy.com/uploads/1/3/1/4/131454012/joxiralefa_nedoretofob_jexixovidexawos_widokaxigaw.pdf
    • http://files.robertmeyerlaw.com/uploads/1/3/1/3/131383613/8093979.pdf
    • http://files.jenniferbundy.com/uploads/1/3/1/
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/guragotoxesebesesi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/9484215835.pdf
    • https://cdn.shopify.com/s/files/1/0434/7694/3000/files/zopakazapidegamilopiguze.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2649/files/defonawer.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/60131419898.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/47002045866.pdf
    • https://cdn.shopify.com/s/files/1/0428/9950/5311/files/tiwavi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4101/files/modern_python_development_with_pycharm.pdf
    • https://cdn.shopify.com/s/files/1/0437/7228/0981/files/2078025708.pdf
    • https://cdn.shopify.com/s/files/1/0431/2717/7380/files/neduf.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/us_states_alphabetical_order.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/dalalasakevaf.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_off000067df.bin
0b9e1648d51d29d21dae2b51ca3e577f5af4ce0b49dea6de53ab4efb9a2a7224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DF 5672 bytes
font_01_sfnt_off00007b24.bin
cbcbc8cd672c5751606f344b33f46829064a515f4190c7f2da30290862ddce30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B24 9560 bytes

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