Malicious PDF — malware analysis report

Static analysis result for SHA-256 1026d4cc8d3d5c62…

MALICIOUS

PDF

45.0 KB Created: 2020-08-14 08:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb813ba9fb2f18a832170c1c99290c05 SHA-1: fd00c4abde7d245cd34f1e47d9942849b3e00970 SHA-256: 1026d4cc8d3d5c6243d996222695c88c2136447df77d40b8230cb4ce447cce94
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service at 'ttraff.ru'. This infrastructure is known for distributing malicious content. The document body, though obfuscated, contains the same keyword as the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness.

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=unirea%20principatelor%20romane%201859%20pdf
    • http://files.synergy-electrical.com/uploads/1/3/0/9/130969681/wumexisarani.pdf
    • http://files.southeugenemusic.org/uploads/1/3/0/8/130873921/2300842.pdf
    • http://files.enviromarc.com/uploads/1/3/2/6/132696146/lilusoromi-xexededop.pdf
    • http://bamitupa.tasmanissues.net/uploads/1/3/2/6/132682646/ginigoxaworibe.pdf
    • http://moleseb.shaunpeknic.com/uploads/1/3/0/8/130873951/vokamupitadiju-kuwowejef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/9342959541.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6471/files/lanokewig.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/41478240018.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/cholesterol_structure_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/66087671323.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/ladunojilered.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/java_reverse_array.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/48870356822.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/wukakujuxarukajuri.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/vebawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/tatonabazakumivipo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9237/files/guitar_chords_for_happy_birthday.pdf
    • https://cdn.shopify.com/s/files/1/0437/9276/0981/files/clases_de_espaol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f74.bin
dc1015c2fb868e31533ff7155e1366e2025ce597a3084448ffd7583073832da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F74 5640 bytes
font_01_sfnt_off00008290.bin
f298fbf9a5d44ce7574e72c412d50db013ad173441de53fc6ea633ee69650e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8290 11132 bytes

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