Malicious PDF — malware analysis report

Static analysis result for SHA-256 85238dd1821710af…

MALICIOUS

PDF

50.3 KB Created: 2020-08-06 12:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80443d8f0e17a4a41668d69c2ff53dfc SHA-1: 381e4ff7734880471db9eb4c682d5c489ed83d2c SHA-256: 85238dd1821710afc9bbc5426f210f1f233d81a19e849d814c49b02f7e09c5fe
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'twinkle twinkle little star mozart piano sheet music pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of numerous links indicates a link farm or SEO spamming technique to distribute malicious content.

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=twinkle+twinkle+little+star+mozart+piano+sheet+music+pdf
    • http://files.dallasbrunchclub.com/uploads/1/3/0/9/130969934/lupomutuxa-sivejema-fogakete-fuxuka.pdf
    • http://files.butchsmetalimages.com/uploads/1/3/0/7/130776350/duzosikukaxejek-xikogojurab-tawezuniwos-palezexawajij.pdf
    • http://files.jaakdekoninck.be/uploads/1/3/2/3/132302924/9233465.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8894/5045/files/44711533268.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/acordes_de_guitarra_canciones_infantiles.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7589/files/logizimoxun.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/18052344986.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/53409929289.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7541/files/xefeferovarenibagutuxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2588/1498/files/56290813345.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/torobuwepoboxowetilopewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/86815377711.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/xizareruzezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/kiwitaxorasawafabolu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/92787176176.pdf
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/asia_map_blank.pdf
    • https://cdn.shopify.com/s/files/1/0437/9426/8320/files/lazofi.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
stream_003_off00006436.bin
e685f7c5ebbd3ba9c42e74df77750700a57895bf17c6fc77937197480a7f44fe		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6436 9756 bytes
font_01_sfnt_off0000843c.bin
a4f0d2808c63519fb580eaf374154a8bc26e71e76f2bf06003275f3ddd09def0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843C 5548 bytes
font_02_sfnt_off0000970e.bin
2c0cf516a31d5f88637512aa2a1c1d564453ecc039846a2eeac8ada54019c077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x970E 9952 bytes

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