Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecd97be1ac39616…

MALICIOUS

PDF

48.2 KB Created: 2020-08-04 21:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a25238986c6aa2cf2bdaccd5f36838fe SHA-1: 8e0035d217fffb7faaa4c9eb143e3273b35fbf36 SHA-256: 5ecd97be1ac39616e392c57e5da5203897a1d63c7f4001903b81b410d14d55d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure related to German spelling exercises, but its primary function is to redirect users to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that the embedded URL `https://ttraff.com/pify?keyword=englisch+rechtschreibung+%25C3%25BCbungen+pdf` leads to known malicious infrastructure. The PDF also hosts a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt to distribute 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.com/pify?keyword=englisch+rechtschreibung+%25C3%25BCbungen+pdf
    • http://files.myhilocollection.com/uploads/1/3/1/8/131871602/suxukitifozejuso.pdf
    • http://files.happyblogah.com/uploads/1/3/0/9/130969192/sesowopa.pdf
    • http://files.teaching.yfolajimi.com/uploads/1/3/1/8/131856713/ae9332.pdf
    • http://files.vaughnschool.com/uploads/1/3/1/8/131856956/sinevodeso.pdf
    • http://files.mdt-agilityability.com/uploads/1/3/0/8/130813646/d8e08e4b4ad9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/8961/7311/files/dixesipit.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/77151302683.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/dopikajidizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/wedinilazazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/57627721620.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0376/files/49835672366.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3062/files/lowes_lancaster_ca.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/air_pollution_control_projects.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/jeposafitidiriluzebilil.pdf
    • https://cdn.shopify.com/s/files/1/0429/6012/6118/files/wuzorejajixudiwedebemave.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/46264684161.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a3.bin
b3dbaeb8bc7c47a776d6e8f94d1592f4161f520cc7134fb7c478ecbcc2ec310a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A3 5196 bytes
font_01_sfnt_off00007807.bin
3de08729bb43177e1f28168df3ab5d7e1317da52b4d811036a542527f3dde9f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7807 13928 bytes
font_02_sfnt_off0000a357.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA357 4324 bytes

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