Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a13f7cef688f28b…

MALICIOUS

PDF

44.3 KB Created: 2020-07-30 01:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3c9995926780cf6e53a596b25fc0b32 SHA-1: 845259d20e92b9e5ea7121b3ca7eee7610aac11a SHA-256: 9a13f7cef688f28b4109dd81f85eb75f9106e97efaebee897d5e967ead414219
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains garbled text, but the presence of numerous embedded URLs, including one pointing to a known malicious redirector (ttraff.cc), suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=dietary+sources+of+calcium+pdf
    • http://files.erinjeannewright.com/uploads/1/3/0/7/130775402/jevagoba.pdf
    • http://files.vikihalfan.com/uploads/1/3/0/8/130815228/7445947.pdf
    • http://files.hauntoverse.com/uploads/1/3/1/4/131438541/gusedu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7971/0360/files/94567855763.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/59304085382.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/7888515180.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3931/files/gutem.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/rovezetejaledudikelatuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/4174430856.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/25232843348.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/wefikepukezaterewodopama.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/14506839271.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9422/files/vufutubujuzijefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/zolibokomuzewuwibududi.pdf
    • https://medlineplus.gov/dietaryproteins.html
    • 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_off0000702b.bin
26b9043bf389bcaf474f55caa8c7fb88ac157476c83a26e94cc0bf4a8a8f8cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702B 5180 bytes
font_01_sfnt_off000081dd.bin
ba4be1ec6f3e573ff8f872b1cebdfc7e7611fc4a96b141d04b5be8219fedd78b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DD 10112 bytes

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