Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dadb4e2e926fc7…

MALICIOUS

PDF

38.3 KB Created: 2020-08-04 12:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6571db42a593aa01cb538dc8a46dc8 SHA-1: 5e95e73835a8f3e77ef0a4f4f37c5ab22722f16c SHA-256: 23dadb4e2e926fc73ab39462cd28f46b3094cbefa1ca7c98b52ff10ea4dee7a9
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, also contains the primary malicious URL. This suggests the document's primary purpose is to lure 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=libro+barrancos+mooney+pdf
    • http://beguba.overlandmetalhead.com/uploads/1/3/2/3/132302780/zetefivewimosole.pdf
    • http://files.thefeltfactory.co.nz/uploads/1/3/0/7/130776841/xizixexa-dajawotubep-fekifomidele.pdf
    • http://files.thewoodenmanger.com/uploads/1/3/2/6/132682386/a1fd6a0c43d0a3.pdf
    • http://files.dreamlivingcoach.com/uploads/1/3/1/6/131606060/9871280.pdf
    • http://files.lostacresresort.com/uploads/1/3/1/4/131452878/nobukozubazuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/63527707568.pdf
    • https://cdn.shopify.com/s/files/1/0435/5765/0584/files/42160387085.pdf
    • https://cdn.shopify.com/s/files/1/0434/1740/3559/files/87898392538.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/30472804843.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/36790836742.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/zesukepasenofixilijuranud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4684/files/38226441453.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/nizijevumurikodisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/31192976482.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3697/files/jowubuwub.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/7010/files/7825276798.pdf
    • https://cdn.shopify.com/s/files/1/0429/9060/0355/files/24347337518.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_off00005738.bin
166a20df706e9a46f40439cf99b37bb181488b9842a43ef4d0bc8f65a375fc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5738 5452 bytes
font_01_sfnt_off000069b6.bin
10ee67557ec20062f73568b64bb0b09dda8e0cb2b556ef974bc96ffeb1612bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B6 10096 bytes

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