Malicious PDF — malware analysis report

Static analysis result for SHA-256 381c82844e9cb79d…

MALICIOUS

PDF

40.4 KB Created: 2020-08-04 23:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f38f5425ee30f5e9d59e21fae2bfae9a SHA-1: a967ad6a6329432b4c6641219bd62b95e84c3355 SHA-256: 381c82844e9cb79d9a667a5a44901bf9c4ae26c3ff96882f6916224f9e8a82ea
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=12+body+systems+and+functions+pdf'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. These factors suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

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=12+body+systems+and+functions+pdf
    • http://files.juicespancakelounge.com/uploads/1/3/2/6/132695329/3175212.pdf
    • http://files.thruhannahseyes.com/uploads/1/3/1/4/131437671/galemixe_xaxetifubizozo_notelude.pdf
    • http://files.narinsedc.com/uploads/1/3/1/4/131437064/jinufonuzita-fefifopase.pdf
    • http://files.thereedmachine.com/uploads/1/3/0/8/130874162/43bd8.pdf
    • http://files.sheldonxink.com/uploads/1/3/1/4/131406274/8491542.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/39903488881.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4357/files/zagadinumiloxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/vigajotakofazubaleken.pdf
    • https://cdn.shopify.com/s/files/1/0434/2969/1558/files/75382981545.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/58126769476.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/98514170353.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/lonafepukenudajolukijufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/12061962403.pdf
    • https://cdn.shopify.com/s/files/1/0440/5759/1960/files/nulelevabojowemo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5050/7167/files/25591511045.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/velede.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/4160606599.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6392/files/96179632424.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_off00006171.bin
a88edfb72a7b7fe6d9389391d927efcc76a3cfd88e786b8603091b6eb0abbbf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6171 5504 bytes
font_01_sfnt_off0000742a.bin
f673741c74370465f9a8bf7db391262edd2cf3d8a869a39eac27387e27fc72dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742A 9488 bytes

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