Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf362df0e3d2f1e…

MALICIOUS

PDF

63.8 KB Created: 2020-08-06 23:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9776902d019b2c8f9cce8f7ddc570a80 SHA-1: f7c1783375ec5ca8e391cc8455a14e41f0c81ae6 SHA-256: 5bf362df0e3d2f1ecc3e3841e2b6e09565727bd0916cae8e73b28e91b7e0af4b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a CTET December 2020 notification. The document also hosts a large number of external PDF links, many of which point to Shopify-hosted files, suggesting a link farm or SEO poisoning attempt. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicate a phishing or redirection attack.

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/pify?keyword=ctet+december+2020+notification+pdf
    • http://files.kaimodeling.info/uploads/1/3/2/7/132710497/sadabovo.pdf
    • http://files.fclcpreschool.org/uploads/1/3/1/3/131383384/sidubobudideba_xetivugozi_kikakimanupe.pdf
    • http://files.aesthetiderm.com/uploads/1/3/1/4/131437925/luzud.pdf
    • http://files.pmehs.com/uploads/1/3/0/7/130776611/likuwor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0436/1394/6018/files/54226794356.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/58057320469.pdf
    • https://cdn.shopify.com/s/files/1/0437/4446/0951/files/57812808914.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8946/files/cirosans_classic_overhaul_v1._6.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/zederaxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/88336097797.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6455/files/levaxoxij.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/milodiwesesozilaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/kusuremifafe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/nilonazofetufovo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/megolevejedurafoxekeviz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/vufejaropuzebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1189/9545/files/ridefelova.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_off0000a23a.bin
93f0bf1b79d8bd33f61e816b287bc94d11afadcf9b5d231c2879e19e34a3fb03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA23A 5408 bytes
font_01_sfnt_off0000b47e.bin
38cc9b726088a382ecde27e5505bf5fc8fa6be47881a0a6d518fc8b78db1d73d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB47E 14752 bytes
font_02_sfnt_off0000e2f7.bin
e098838b833941c7b30bde78c012144f0f5464fa22b981aeb8a04b97b231dd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 3776 bytes

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