Malicious PDF — malware analysis report

Static analysis result for SHA-256 461ca569a8d04d23…

MALICIOUS

PDF

56.1 KB Created: 2020-08-24 09:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3909c6788d0577dd4ea013205b0f84e3 SHA-1: b67b883386d09839211915a486a1c56f6e4c1ada SHA-256: 461ca569a8d04d23580d81a4145d53c5ae41ceea970f9fa8db9d5f8a10fd4b26
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary malicious URL being a redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, likely for SEO poisoning or to distribute malware. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the document body and link structure suggest a lure to external malicious content.

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=bucolicas+virgilio+pdf
    • http://tulati.capecurbappeal.com/uploads/1/3/1/4/131437119/fowifebidaxunufani.pdf
    • http://files.greenkayla.com/uploads/1/3/1/6/131636697/tetusidudepab.pdf
    • http://lekuwalev.lifeword.nl/uploads/1/3/0/9/130969204/simadegovis_bemuzasux.pdf
    • http://files.bswiatkiwskybowen.com/uploads/1/3/0/7/130738806/3afa1b5.pdf
    • https://cdn.shopify.com/s/files/1/0429/0455/1590/files/analisis_marginal_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/1226/7937/files/clumsy_ninja_mod_money_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3986/7559/files/katubosusemisojof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/95029640587.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/66129846555.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/43643188331.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/xiwuxuni.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/52841713863.pdf
    • https://cdn.shopify.com/s/files/1/0439/8183/2350/files/tuxafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizuvesadumewagetikuxumut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/jimetedug.pdf
    • https://cdn.shopify.com/s/files/1/0437/9400/6177/files/guia_entrenamiento_calistenia.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_off0000986c.bin
fda18c00d4bb5eb186eb77475ba5769a0bdc55cd90d7ef9f61324def0f722507
pdf-font-stream PDF embedded font (sfnt) at offset 0x986C 5432 bytes
font_01_sfnt_off0000aafe.bin
c2078957f5f423b66d5cec34909a95ab265d71aa47cbd65a5f5bd32082baa53a
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAFE 12136 bytes