Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1eb35fc61623b92…

MALICIOUS

PDF

81.8 KB Created: 2020-07-31 02:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9616698b2bb4d5808c7b75e02a83306 SHA-1: 3a03f59a90892f6bcf27fda62ab7b7fa3082f3ff SHA-256: c1eb35fc61623b9202fe60bf0f138276aca3c3fac388af998d10b9aa9928fdc1
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link directs to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes the search query 'Diferencia entre gigantismo y acromegalia pdf', indicating a social engineering lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=diferencia+entre+gigantismo+y+acromegalia+pdf
    • http://files.tobyupci.com/uploads/1/3/0/8/130813614/c4307d0a.pdf
    • http://files.profisor.com/uploads/1/3/0/9/130970016/6b23d.pdf
    • http://files.cslconsultingllc.com/uploads/1/3/1/0/131070196/ziraxoverewu_bejebokerofuta_gesovidusokusab_xejosipu.pdf
    • http://files.flower-scentral.com/uploads/1/3/0/7/130738933/4964560.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/zepizelenevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/6517375494.pdf
    • https://cdn.shopify.com/s/files/1/0433/6415/5560/files/takilobelakeruvedijuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/bowitufifeletudesidezedew.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/meragetamuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/wugupozavet.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/ramab.pdf
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/pewow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/nelep.pdf
    • https://cdn.shopify.com/s/files/1/0433/7441/1926/files/buxuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/bozubinamorulovazorubid.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/sufadulojugi.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_off00010080.bin
0c328f1e030c6f8fcdff1d608054f016f2122832450b18647b23c56a123ece6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 5364 bytes
font_01_sfnt_off000112ab.bin
0ed37f2b6b2dfc6d7c31f5538415e510ba8c7a89f05bc76b6418cc98f5a70564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 11236 bytes

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