Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58dcbbbad149cc2…

MALICIOUS

PDF

34.2 KB Created: 2020-08-11 18:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aad5dd0c2b92b8b0de08fdef55d25823 SHA-1: 712bf01cab128eb3fcb1f5ccfa4ef847d6e068b9 SHA-256: c58dcbbbad149cc26001c63af3bc0fc8311a593f4855453fa8182295470d9b20
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of external links, many pointing to a redirector service. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'here i am to worship chords in c pdf' and the wkhtmltopdf application, suggesting a lure document. The primary malicious IOC is the redirector URL, which likely leads to a further stage of infection.

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.cc/pify?keyword=here+i+am+to+worship+chords+in+c+pdf
    • http://fetapudil.hogridin.com/uploads/1/3/2/3/132303382/pipugavudagotu_bumedinoguj_jinoliwiwusi.pdf
    • http://files.gcfishandgame.com/uploads/1/3/0/8/130813846/de9233545d77a.pdf
    • http://files.daviddukart.com/uploads/1/3/1/4/131483097/e9ce6c5994.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/sufiwegulexogub.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/zewesobogolifobafuduz.pdf
    • https://cdn.shopify.com/s/files/1/0439/0381/1739/files/xitigijadotagegirijudub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0433/3302/5960/files/decrease_size_acrobat_pro.pdf
    • https://cdn.shopify.com/s/files/1/0435/2186/7930/files/zomikadofofizikazutekas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0440/6942/1206/files/arcanos_maiores_do_tarot.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/alloplastyka_stawu_biodrowego_pozowski.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/darepibuso.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_off00004308.bin
b2e8ac6edf3a21ea497b97770aab0af5deae52b8d86e37cd13f0791fa0a4ee77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4308 5416 bytes
font_01_sfnt_off0000555e.bin
20bb8d769e846be42f29fc2de60d556ad76be6a21f6ef5f819467b53b1d38a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x555E 12408 bytes

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