Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e98bd53a4ede3af…

MALICIOUS

PDF

43.3 KB Created: 2020-07-13 22:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bbe9dfecbdd58e53df346912adef728 SHA-1: 55d1d00081fbb6677cc8c5ffaf362ca05debae9d SHA-256: 4e98bd53a4ede3af79a13660d852470b7bbeddf4aa40b78a24a59d6a12afa7df
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, appears to be related to insurance regulations, suggesting a lure. The presence of numerous external PDF links, many hosted on cdn.shopify.com, indicates a potential SEO link farm or a method to distribute malicious content disguised as legitimate documents. 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.ru/wb?keyword=irda%20new%20regulations%20life%20insurance%202019%20pdf
    • http://files.kccis-ib.com/uploads/1/3/0/8/130873810/8124611.pdf
    • http://files.waleskarosario.com/uploads/1/3/1/4/131438758/9744174.pdf
    • http://files.eada-cwc.com/uploads/1/3/1/3/131379059/vomomakamabo.pdf
    • http://files.waleskarosario.com/uploads/1/3/1/4/131438758/9744174
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mazimuzoxoku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0432/1653/5720/files/kukaduberijob.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3598/files/pikata.pdf
    • https://pimurijuwan.files.wordpress.com/2020/07/86665115851.pdf
    • https://safowazebafo.files.wordpress.com/2020/06/rozexunubapot.pdf
    • https://xubutamim.files.wordpress.com/2020/06/nukajefutiku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67062005494.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/18007550564.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/77996641210.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/94623525419.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0968/files/wunobir.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_off00006ada.bin
f6e44cdb1cb43bd631728d2647f90db652414de24df2321de7377ed4437e86e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADA 5716 bytes
font_01_sfnt_off00007e6c.bin
65fdb93dd9ffb80d84d98fef1fa31d650c9f2ab1cc2e457abc8e3e5fee5bcb38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6C 9840 bytes

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