Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30552f9794a1381…

MALICIOUS

PDF

42.8 KB Created: 2020-08-08 18:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24914af01969e4ef32b83c8f3c226ac2 SHA-1: 6f708d8600c71a254e75dfa791803e9aba3014f3 SHA-256: d30552f9794a13818f6cab46f5ee0ff5badecf3533029622f29545ee15f3a758
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic indicates a malicious redirector link to 'ttraff.cc', which is used to obscure the final destination. The document body, though heavily obfuscated, contains the URL that is also present in the heuristic findings, reinforcing the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=bharathidasan+university+ma+english+syllabus+pdf+download
    • http://files.kidsbookbookclub.com/uploads/1/3/0/9/130969151/givubawegin.pdf
    • http://wisulag.vanesanieri.com/uploads/1/3/1/6/131637136/xevoxefamevifok.pdf
    • http://riduzut.episcopalchurchmediator.com/uploads/1/3/1/4/131438405/d44a9.pdf
    • http://files.sundevich.com/uploads/1/3/2/6/132695694/86992d.pdf
    • http://files.talae.org/uploads/1/3/1/3/131383823/931540.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/kilot.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/98690854505.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lobusine.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/22478044058.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/93509668104.pdf
    • https://cdn.shopify.com/s/files/1/0428/9747/3699/files/instagram_security_code_generator.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/54449679122.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/vadaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1036/files/keep_the_aspidistra_flying_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8646/3647/files/21413374453.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/nolapuwizabuzirakavop.pdf
    • https://cdn.shopify.com/s/files/1/0433/4760/7720/files/asa_sample_paper_purdue.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/bikawasaron.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006748.bin
2e45a4500739e71e07b10c7e2d8be3d7ba0fb2c6015c9f6f68ad2ae8a71bc05f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6748 5900 bytes
font_01_sfnt_off00007b4a.bin
42c87edf91b891036fbc56b5cdc77eeb326e77eddfb0a5b4eeb42bf468f46914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4A 9948 bytes

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