Malicious PDF — malware analysis report

Static analysis result for SHA-256 c823a6727c45c9d3…

MALICIOUS

PDF

80.8 KB Created: 2020-08-09 09:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae231214f1635e477ce1c9a818714c4a SHA-1: 37ffad86c494d88eaee73624fc55403279078d2f SHA-256: c823a6727c45c9d3a1e5665ab4ee8d336576b2b77971b391f4bbf87c1c70e094
150 Risk Score

Malware Insights

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

The PDF file contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'pathogenesis acne vulgaris pdf' and the malicious URL, suggesting a lure to a malicious site. The presence of a PDF link farm heuristic further supports the malicious intent of directing users to external, potentially harmful, content.

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=pathogenesis+acne+vulgaris+pdf
    • http://files.schanwriter.com/uploads/1/3/2/7/132740925/lufedojizepenesojuw.pdf
    • http://files.starfrappefranchise.com/uploads/1/3/1/4/131437379/mulibegap.pdf
    • http://rijoribe.housingcourt4all.com/uploads/1/3/1/0/131070767/ronelekoloni-fasar.pdf
    • http://files.moabgearheads.com/uploads/1/3/0/8/130813837/4607838.pdf
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/padirudebeposerasuvugurev.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/git_update_branch_with_master.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/govuwajato.pdf
    • https://cdn.shopify.com/s/files/1/0437/8751/8104/files/48428069464.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/the_jaunt_read_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/3563/8425/files/99253683396.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/5842715335.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/banomawezezolaralemur.pdf
    • https://cdn.shopify.com/s/files/1/0437/4665/6408/files/burger_king_coupons_juni.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/rubabobuwekifirevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3623/7206/files/vazavitujulokifig.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_off0000f56e.bin
038e822488db0aff26168d179f80553f5b1529d6ceaef58fab2d71fe8ecf04d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 5476 bytes
font_01_sfnt_off00010819.bin
95b98ca1dd7b1ecfca20fa7d75087d92b39848d72fdff6a022a30ce133e19f4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 14796 bytes

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