Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6c9b0e36b03305…

MALICIOUS

PDF

42.3 KB Created: 2020-08-23 01:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e733a45ba6588067dd4e09f007a94db SHA-1: 13edd2fa5bf77652d9bda5b409a1f2fd6b3e2963 SHA-256: 2b6c9b0e36b03305acf305b1cec02cdcd74f2eaeeee913c2a7cccaa72a39631c
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though partially corrupted, appears to contain keywords related to product searches, suggesting a lure to disguise the malicious links. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to redirect users 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=black+wedge+platform+shoes+womens
    • http://mukupa.farmarik.com/uploads/1/3/1/4/131437657/wusodar.pdf
    • http://files.jck9services.co.uk/uploads/1/3/1/4/131437626/xabazubasal_zabavawo.pdf
    • http://voziwoxi.kinderdancemetrostl.com/uploads/1/3/0/8/130814328/6302927.pdf
    • http://jowureru.signcentraltn.com/uploads/1/3/0/7/130775320/worojanugufi_misewiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8275/1893/files/replanteo_planimetrico_y_altimetrico.pdf
    • https://cdn.shopify.com/s/files/1/0463/5194/1793/files/bdo_best_afk_fishing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/interrogative_pronoun_worksheet_esl.pdf
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/resovumugamomasepejo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/gap_jeans_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/bazojebokogegobumoruje.pdf
    • https://cdn.shopify.com/s/files/1/0428/3265/8588/files/firizemosizode.pdf
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/gugukuvugozemigitesadovun.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/23660896718.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/40112894851.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_off00004c37.bin
fe40ae88757e037fdaf8380511918b2e5ffe4c8038e56be6911cff93f19d6ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C37 5516 bytes
font_01_sfnt_off00005edf.bin
5f6bd23d8114b57d561ba42ae8396ad8b5bdda4b368d3ae6a653d62322849a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 14936 bytes
font_02_sfnt_off00008c8e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8E 4324 bytes

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