Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c3291c85a756c4…

MALICIOUS

PDF

44.1 KB Created: 2020-08-17 00:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2f7f8137c1a1db85ff446cf940424e8 SHA-1: c4c777b7534b107a289a8329f015f96fd81f17be SHA-256: a3c3291c85a756c476f8d597de8edbdf3e603455d4fe8229fe4e8933aa6f1ea6
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=free+customizable+certificate+of+completion+template'. This URL is presented within the document body, disguised as a link to a certificate template. The file also contains a large number of embedded URLs, many pointing to Shopify, which is a common tactic for link farms. The ML classifier strongly flagged this PDF as malicious.

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=free+customizable+certificate+of+completion+template
    • http://files.myelegantweddinghk.com/uploads/1/3/2/6/132681826/tinad-lofejojen-nesuw.pdf
    • http://files.researchingthewest.com/uploads/1/3/1/3/131380158/lelune.pdf
    • http://mujugax.petervermeersch.net/uploads/1/3/0/8/130813458/76aa2a65bdae141.pdf
    • http://vinutopa.funnyfacespz.co.uk/uploads/1/3/1/4/131452976/5788249.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6231/files/bhosari_midc_electronics_company_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/18315829848.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/jopudujovakepi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0300/2523/files/vevaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/tatefix.pdf
    • https://cdn.shopify.com/s/files/1/0440/2819/9062/files/taxunijafifoninin.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/niwizijoxegatob.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/40067060333.pdf
    • https://cdn.shopify.com/s/files/1/0434/3952/1958/files/2566740277.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3069/files/14777709204.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6901/files/cryptocurrency_trading_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006240.bin
5a37abec0b2ba6ebc3ba2ac22b5c18dd3c9d6d96e6c41b04df40beaebc1390bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6240 5188 bytes
font_01_sfnt_off000073ca.bin
cebee9f74aa935ebc0d5da913bff91452d9fab36b1125af936954ab78bcab0c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 9748 bytes
font_02_sfnt_off0000951f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x951F 4324 bytes

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