Malicious PDF — malware analysis report

Static analysis result for SHA-256 941358b2c03853ec…

MALICIOUS

PDF

71.3 KB Created: 2020-08-16 23:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a2bc8192868e0e4ac87fd91c2605400 SHA-1: 1bdd46f8b8582695f54b10726c99f350d9f575b4 SHA-256: 941358b2c03853ec285a02d607b4d3ff424d4d91c5753a53cc816b2a1a0a073e
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristics, suggesting a lure related to 'organism classification coloring page answers'. The presence of numerous external links, as noted by PDF_SEO_LINK_FARM, further indicates a malicious intent to drive traffic to potentially harmful sites.

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=organism+classification+coloring+page+answers
    • http://files.specialtyfitnessinc.com/uploads/1/3/2/7/132712315/nenotuxonopizarikive.pdf
    • http://pewux.summitpsychology.net/uploads/1/3/1/4/131407057/xigopivezafevud.pdf
    • http://files.afftonparentsclub.org/uploads/1/3/0/8/130814126/givoviv-tejovigameta-nokufoliwevu.pdf
    • http://files.nomadicivories.ca/uploads/1/3/2/6/132681985/7467895.pdf
    • http://files.jusrydetrackclub.com/uploads/1/3/1/3/131383544/bfce0c4aa15936.pdf
    • https://cdn.shopify.com/s/files/1/0447/7625/9735/files/macos_merge.pdf
    • https://cdn.shopify.com/s/files/1/0435/8189/8913/files/tuloruvimodozadadonikiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9408/0677/files/12076684760.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12091312038.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/online_marksheet_verification_mp_board.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/zupobuvowifamenav.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/48065397133.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/vewogiki.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5821/files/lofemel.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/nadudofagarakakowatevir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce14.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 2828 bytes
font_01_sfnt_off0000d80e.bin
866e9dc99bb17486e03e639512db7e4a24b1bd841d40e4fe5b2ecdc0a4fc3cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 5456 bytes
font_02_sfnt_off0000ea94.bin
0116af96e5cabcb46e2e6f658b97b17783aa71c6950e812249a165b61e373786		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 10156 bytes

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