Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c891d45278693d…

MALICIOUS

PDF

43.2 KB Created: 2020-08-26 07:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7038cea1b8d8b505b39a17714b74e8ab SHA-1: c37d1ad26f909a361d76da5e7a923c38100a9013 SHA-256: 66c891d45278693df4580ddb59a044440d3e12d17e5fa601c1c155677ee9ff41
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. The document body text, though partially obfuscated, includes a URL that appears to be the primary lure, disguised as content related to 'Scarlet heart ryeo ep 17 eng sub dra'. This suggests a phishing or scam attempt to redirect users to malicious infrastructure. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate malicious intent.

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.cc/pify?keyword=scarlet+heart+ryeo+ep+17+eng+sub+dra
    • http://files.airmicrochip.com/uploads/1/3/0/7/130776603/6adfa4.pdf
    • http://files.cestagift.com/uploads/1/3/1/1/131163601/tezuxijolamokub_bozolugadajaso.pdf
    • http://files.howweglow.com/uploads/1/3/1/0/131070523/wafurug_xuxovabejenoj_bovezolewek_birosa.pdf
    • http://files.artnurture.com/uploads/1/3/1/4/131483214/vinotop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/farmall_cub_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9137/8854/files/pijavute.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3984/files/54848403793.pdf
    • https://cdn.shopify.com/s/files/1/0432/1394/7041/files/counter_strike_para_ifresi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1373/2512/files/95468727239.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/35209242174.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/50541840681.pdf
    • https://cdn.shopify.com/s/files/1/0437/9590/6721/files/16718221572.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/mobojadarivefisibe.pdf
    • https://cdn.shopify.com/s/files/1/0465/5788/8662/files/68190893610.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_off00005a82.bin
750f2c60107e131a590280d986a309c185dad9ea69a5a4f0f25aba6359eaaf8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A82 4080 bytes
font_01_sfnt_off00006900.bin
69b3e568c93c6e7015aaefe47911f21833df7dbcdab7471edc87b9b95f235f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6900 5812 bytes
font_02_sfnt_off00007cc0.bin
99f676dd1617d1732b8d8cf78675f6f76af61f4f6a1b36d3528da61d8214abec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC0 10228 bytes

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