Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c854bf4adfdbdde…

MALICIOUS

PDF

54.1 KB Created: 2020-08-16 18:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4ef4312e4c465ec33c83958342ed40f SHA-1: d31f629869ef2a80e7ffe7aaa291bea3fdc8a77f SHA-256: 9c854bf4adfdbdde1d63a4d39cb7c6024e7faec1b090af4d3028a90d6a7d6850
230 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.cc/pify?keyword=2018+english+films+free'. Another high-severity heuristic indicates an invisible link to 'http://files.medical-equipment-solutions.shop/uploads/1/3/1/4/131482931/6763599.pdf', suggesting a lure to a suspicious domain. The PDF also exhibits parser evasion techniques. The combination of these factors strongly indicates a malicious intent to redirect users to potentially harmful content.

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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=2018+english+films+free
    • http://files.medical-equipment-solutions.shop/uploads/1/3/1/4/131482931/6763599.pdf
    • http://files.n947rv.com/uploads/1/3/0/7/130739783/5210881.pdf
    • http://files.rosajoshi.com/uploads/1/3/2/7/132740277/8127169.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/echo_server_python.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/vufawoguwapudogikani.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/64328723905.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/risajefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8334/9657/files/amiodarona_mecanismo_de_ao.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/aectp_250.pdf
    • https://cdn.shopify.com/s/files/1/0448/1653/1617/files/conjunctions_worksheet_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0447/9614/9921/files/exercises_with_imperatives_affirmative_and_negative_form.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_off0000958a.bin
db4e063af58c7a9e2af9de2bea3fad112bf91602944f7255ec9e1a29f2ed3b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x958A 5396 bytes
font_01_sfnt_off0000a7b5.bin
aae9affedd20c628ac986198a9ff3fc396326bcdc0d00c68e7a146ea975bdea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B5 10912 bytes

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