Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed4ee52bf303d07…

MALICIOUS

PDF

40.5 KB Created: 2020-08-12 06:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1e0d213cebb04fe64c4a62539f1ec5b SHA-1: 00bfef0b1c462c3fc007964d8e9e80d647e131f1 SHA-256: 8ed4ee52bf303d0727d421575693e93437fb5c769b34dfe9ca4abbef33b75148
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text suggesting it's a lure for 'chaupai sahib pdf full', likely to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL.

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=chaupai+sahib+pdf+full
    • http://files.thriveyouth7.com/uploads/1/3/2/6/132682124/meropekipuzu-robeputavarak-zigonod-nabanu.pdf
    • http://files.dublintaiko.com/uploads/1/3/1/0/131070911/wovakawonisefoban.pdf
    • http://suwapelup.cu1events.org/uploads/1/3/1/4/131453850/6eb42c71ea.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/vumelisu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/82597053688.pdf
    • https://cdn.shopify.com/s/files/1/0436/8944/3483/files/53198814991.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/87729967093.pdf
    • https://cdn.shopify.com/s/files/1/0429/5101/6614/files/jurojusezagujad.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5915/files/69999991568.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/wasomijulavus.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/9180253303.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/tigonubo.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_off000062e1.bin
5969199abec4fc458396c2a178f572ad4834ac1c542c6f8c1de278b89794b65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E1 5076 bytes
font_01_sfnt_off00007419.bin
1b9af27cc8bed0016d097275e6a68ab92a85e362188d26322c888ebd628a8aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7419 9892 bytes

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