Malicious PDF — malware analysis report

Static analysis result for SHA-256 17abc8eb0f5a3ffb…

MALICIOUS

PDF

58.6 KB Created: 2020-08-15 22:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e07d41abe8aa209e4574ea7e0cf4244 SHA-1: 101a5b61c73b807368ea08ff38c4487a62c3fdf1 SHA-256: 17abc8eb0f5a3ffbdeec6c0b3792a8abf9b6dc4066b4e7ae156194f1b80cb079
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Mktime php manual'. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests a link farm or SEO poisoning tactic to mask the malicious redirector. No scripts were extracted, but the primary malicious behavior is the redirection to a known malicious URL.

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/wb?keyword=mktime%20php%20manual
    • http://diboru.mysteryofmagic.com/uploads/1/3/1/8/131856726/zewoxuwaxoku.pdf
    • http://tejuson.blockchainmena.fintecnet.com/uploads/1/3/2/6/132682787/cbac2ca8af44234.pdf
    • http://pinimi.shadesproject.com/uploads/1/3/1/4/131407406/6594877.pdf
    • http://files.tyewinkinmink.com/uploads/1/3/0/7/130775746/176989.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/17042639993.pdf
    • https://cdn.shopify.com/s/files/1/0450/3427/4966/files/word_bestanden_samenvoegen_tot.pdf
    • https://cdn.shopify.com/s/files/1/0434/4823/8236/files/timukuzibitemezawavupomib.pdf
    • https://cdn.shopify.com/s/files/1/0437/6238/5045/files/rorewan.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/13969448790.pdf
    • https://cdn.shopify.com/s/files/1/0440/1099/5862/files/rightfax_administrator_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/3994188383.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/geromemugidovedekaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/fumaguvomevaboxez.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/dapupar.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/sexagor.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/riwafisepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/38339592028.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/49937886298.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009922.bin
ed8196f1c5f36ee98ba09870ff4523830f12be16bc95d4de56630a84672eab9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9922 4856 bytes
font_01_sfnt_off0000a987.bin
2b369fe705c5d38073a2b21bae2ed8ee8c326044f32534f23e3f8954af2ac0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA987 16324 bytes

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