Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93a67ae3ccb2a08…

MALICIOUS

PDF

34.2 KB Created: 2020-08-12 10:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c95811b7b5b1f7496f5d3b19c1d2395 SHA-1: e4a0da483ce9d6eb532b1314150e3860b569edf5 SHA-256: d93a67ae3ccb2a08b0615a64ea79ebc7a38b359e05fb18a378c54e4dc4f6eec7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=bukhari+shareef+urdu+pdf'. This indicates the document's primary purpose is to redirect the user to malicious infrastructure. The PDF also exhibits a link farm behavior, with numerous embedded URLs, many of which are hosted on Shopify and point to other PDF files, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=bukhari+shareef+urdu+pdf
    • http://monajolog.bbfsfiresafety.com/uploads/1/3/1/3/131383478/739468.pdf
    • http://redufe.emmaandjasonsayido.com/uploads/1/3/2/6/132681504/8128423.pdf
    • http://files.cisband.org/uploads/1/3/0/9/130969751/7777249.pdf
    • http://files.matsujewellery.com/uploads/1/3/2/7/132712163/rowozotogomimij.pdf
    • http://files.envisioned-events-elite.com/uploads/1/3/0/7/130776855/7389224.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6578/files/junji_ito_chair.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/logode.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/arthur_rimbaud_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/63500637329.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3767/files/jesaguvororu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/list_of_synonyms_and_antonyms_for_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0431/6296/0023/files/fovufaderirobiragisoti.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/42521969817.pdf
    • https://cdn.shopify.com/s/files/1/0444/2842/7431/files/48634548350.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/nomanabegorizebolawa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/bonawigogumekemale.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dilos.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/pazabepozuzisubokigususim.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_off000049df.bin
3576f506b5aabd70db7880378f1e9a023bc5cce735442c653a95566c18ba7947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49DF 5212 bytes
font_01_sfnt_off00005b8f.bin
3860c6b7f50105205bc8e699cf4e40f231eaa61650390481e6b1261da29bc32c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8F 9516 bytes

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