Malicious PDF — malware analysis report

Static analysis result for SHA-256 db66100f3ef2f0f4…

MALICIOUS

PDF

56.6 KB Created: 2020-08-01 11:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 332432c67c54dfb3158d259e977938eb SHA-1: b61008256f6b958116770b5edf29722875fd0e6a SHA-256: db66100f3ef2f0f4b64c55521ce09839db51f43a1264db3a0c43d806f3f0da2f
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of the malicious redirector URL and the link farm heuristic suggest an attempt to lure users to malicious content or manipulate search engine results.

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=latex+bar+over+letter
    • http://files.dancewiseforparkinsons.com/uploads/1/3/0/7/130775868/nanul.pdf
    • http://files.zpcreatewithnature.com/uploads/1/3/0/8/130873728/fisazipekewo-ranimawarujesen.pdf
    • http://files.autismartbymitchell.com/uploads/1/3/0/7/130740536/5a70f894c8.pdf
    • http://files.oconnorsmusic.net/uploads/1/3/0/8/130814868/a02c9652487d.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/komoxubuwuruwox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/tikezazakibawajuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/deliwakenuxadoredevajojiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0376/files/lajufo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/pegimebamozanisuradapo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/lapuwavofiwojiseba.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/momijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/74157310697.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0429/2644/0607/files/66220874218.pdf
    • https://cdn.shopify.com/s/files/1/0440/5320/1046/files/php_get_memory_usage.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/topugafiduwijofexer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2511/files/sujofuvurowegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/60194698402.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_off00007fe5.bin
5496d0618519c86e8e580622fea9c201bb1f36fbf39cd3b0e483191fb26cf265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE5 4712 bytes
font_01_sfnt_off00009002.bin
c401d2c2977681b08341a3471bdb6d4b47c4585eb0252a4686fe0a9c497fd9ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9002 15228 bytes
font_02_sfnt_off0000c026.bin
caea212bfaaf2897f4851770f673d25c90b0e412378cb4b0d6f36fafa9739068		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 16072 bytes

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