Malicious PDF — malware analysis report

Static analysis result for SHA-256 4692e2c01c716f0c…

MALICIOUS

PDF

39.3 KB Created: 2020-08-16 12:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f098be80ba307d571e666bc8e0f2ff SHA-1: c74a89fcd014098ed613d8256dfe57a6b795a952 SHA-256: 4692e2c01c716f0c4e332776f92ac4449cdd31e07e153be47360793c837daee9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains that appear to be part of an SEO link farm. One specific URL, https://ttraff.ru/pify?keyword=jurnal+participatory+action+research+pdf, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=jurnal+participatory+action+research+pdf
    • http://jupaz.thegoodgatherings.com/uploads/1/3/1/4/131452938/abd49d7edd8e.pdf
    • http://files.suitedreams.com/uploads/1/3/0/9/130969761/885419ab6ae9a.pdf
    • http://files.deepbluefiji.com/uploads/1/3/0/7/130739444/wejalugidaza_bolukutit.pdf
    • http://files.virginiabeachtimeshare.com/uploads/1/3/1/8/131856743/vetenemidu.pdf
    • http://files.cobblestonecottagequilts.com/uploads/1/3/0/9/130969939/dedawisoxife-dejadetova.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/the_infinite_sea_epub_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/71037542212.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/71768480318.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/honda_gcv190_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45287622464.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/sikizugujojamewufopa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/tibuvoporonapata.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/51769455963.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8083/files/59124195422.pdf
    • https://cdn.shopify.com/s/files/1/0429/1218/6531/files/19894549493.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4839/files/sifaxorimibawadojalajiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/94527074554.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/basic_english_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/nesetunenil.pdf
    • https://doi.org/10.14421/jpm.2017.0
    • 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/
    • https://cdn.shopify.com/s

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b56.bin
66bf73802627e76ff4e27e889850a9f40ae56db2f0604a16ddfff2ff6aad485d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B56 5336 bytes
font_01_sfnt_off00006d75.bin
63a434a7dbe6119ad226a1b3b4f5b36ef7626d15f4e3b6d8f30040b309abdac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D75 10172 bytes

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