Malicious PDF — malware analysis report

Static analysis result for SHA-256 85663a0146af8ab4…

MALICIOUS

PDF

53.5 KB Created: 2020-07-09 04:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17cfd44420a0c331397b129215dd1d7f SHA-1: 677075f44157936b8d3127bcaa09620e44b2d4af SHA-256: 85663a0146af8ab4f979414ad571b680dda23a5f27136f85ea5ff9f6524159bf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document employs a lure of 'story books pdf download free' to entice users. It contains a high number of embedded links, with critical heuristics identifying a malicious redirector at 'https://ttraff.com/wb?keyword=story%20books%20pdf%20download%20free' and a link farm pointing to potentially malicious content. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=story%20books%20pdf%20download%20free
    • http://files.spamitzvah.com/uploads/1/3/1/3/131384789/2268709.pdf
    • http://files.minutemanresources.com/uploads/1/3/1/4/131438840/9130043.pdf
    • http://files.mtviewcrc.org/uploads/1/3/1/8/131871515/dofebekuwosuxoka.pdf
    • http://files.iscebs-kc.org/uploads/1/3/1/1/131163561/9088835.pdf
    • http://files.sewingisabusiness.ca/uploads/1/3/0/9/130969548/fapelazuvipu-lowuwoviwiwuku.pdf
    • http://files.gsportz.com/uploads/1/3/0/8/130873876/fanukidudikol-taligike.pdf
    • http://files.joannegreencounselling.com/uploads/1/3/0/7/130739558/2283561.pdf
    • http://files.mrsgoldsteinsclass.com/uploads/1/3/1/1/131164567/8252870.pdf
    • http://files.victoriathatcher.com/uploads/1/3/0/8/130815095/nibum.pdf
    • https://kikivolepo.files.wordpress.com/2020/06/19867902229.pdf
    • https://mapinazoten.files.wordpress.com/2020/06/1915401888.pdf
    • https://pipoxoxid.files.wordpress.com/2020/06/11626670148.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.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_off00009404.bin
f0bddfcf3bea26f87e822a671c5680fb4953cd39089a5320ebd71ebc329b6be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9404 5276 bytes
font_01_sfnt_off0000a60d.bin
2937ebfeb92bc449999a11fa15ca67fe54c28ef1bf5f26fb87f4d46967f4a06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA60D 10416 bytes

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