Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3d90fe7f41dd80…

MALICIOUS

PDF

44.5 KB Created: 2020-07-22 00:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f422a1f79533ac838e5675fdb6b4f5ba SHA-1: e40b0235f51d38cb4ae5420ef5f07eea4758b0a2 SHA-256: 0c3d90fe7f41dd804bf9482778261a7528f3f8ed3e27143d417ac2a1296e1124
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, appears to be a technical guide, likely a lure to encourage clicking the malicious link. The presence of numerous external PDF links also indicates a link farm strategy, potentially for SEO manipulation or to host further 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.cc/wb?keyword=remove%20domain%20controller%20from%20active%20directory%20manually
    • http://files.nansrivat.com/uploads/1/3/1/4/131453255/8734041.pdf
    • http://files.jmontanaphotography.com/uploads/1/3/1/8/131857580/rejol-zofejemosor.pdf
    • http://files.theuofstrength.com/uploads/1/3/0/8/130813516/soruzase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/89923285717.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/50349352584.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/rujuzivixurisu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/89317407500.pdf
    • https://bafegetut.files.wordpress.com/2020/07/16814977050.pdf
    • https://tubeduk.files.wordpress.com/2020/07/gezogilafumesorozaxuvuku.pdf
    • https://sumirowa.files.wordpress.com/2020/07/seven.pdf
    • https://pigarudumo.files.wordpress.com/2020/06/jifarolimazexijuwaboxiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/jolited.pdf
    • https://cdn.shopify.com/s/files/1/0431/7288/8742/files/gavitenivatijexik.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/satevawejelefuwisozef.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1706/files/7638140571.pdf
    • https://cdn.shopify.com/s/files/1/0432/9757/0980/files/45021642593.pdf
    • https://cdn.shopify.com/s/files/1/0438/1209/4109/files/55179086588.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3077/files/20242094900.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/68902619648.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000719a.bin
80bccdf050024ac64c5f765d45cb8a2c46aa1f12cee6d51f56d59847796ccfe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719A 5040 bytes
font_01_sfnt_off000082b6.bin
77bfdda08ade86b577444c8cebb036010016fb549edf6eef0b319a9cbac6588e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B6 9636 bytes

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