Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a568ef8627073c…

MALICIOUS

PDF

55.1 KB Created: 2020-08-25 06:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c84e58f235ab2132af3d913db7fd173a SHA-1: 16664be9bc83afa15c9fdc30988eaa86fb7dc0c4 SHA-256: 98a568ef8627073ca2bf94dc7002a1402e95c76fbec48786fad36caf6fd8de4b
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its structure containing a large number of external links, characteristic of a link farm. One of the embedded links, 'https://ttraff.cc/pify?keyword=harkipta+2+bangla+natok', points to a known malicious redirector. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a container for malicious links.

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=harkipta+2+bangla+natok
    • http://nikiw.asapsignsmi.com/uploads/1/3/2/3/132302921/virazetaravuxadubari.pdf
    • http://files.thetastingspoon.org/uploads/1/3/1/3/131379718/fivipoxoveven.pdf
    • http://files.artisanmadegemstones.com/uploads/1/3/1/8/131857540/9dc1300.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/49961658069.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/44475454300.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7430/files/pedibobeju.pdf
    • https://cdn.shopify.com/s/files/1/0436/2957/6352/files/random_ip_address.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0730/files/11993639441.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6637/files/fubigoxabixesumuwifirob.pdf
    • https://cdn.shopify.com/s/files/1/0438/1173/3664/files/c2_exponentials_and_logarithms_worksheet_d_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/49758902343.pdf
    • https://cdn.shopify.com/s/files/1/0434/7818/8198/files/26315450459.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/lalenuvobaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/come_scaricare_aggiornamento_android_senza_wifi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ae.bin
b6d22552ea6e3747810279ab898bb28bea081654d549a1fcedc410717dd4f5ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AE 5108 bytes
font_01_sfnt_off00007611.bin
6b391259afa34b9f88e748502d6f079d5d45323e8378a392b9a7cfe0b1501ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7611 5432 bytes
font_02_sfnt_off000087de.bin
9d4ef371de55afed70a0e8cf90504a0c51b30af8369d06347b00f6bd88da1c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DE 16080 bytes
font_03_sfnt_off0000ba14.bin
d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 16060 bytes

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