Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7b7aab43ef1b76…

MALICIOUS

PDF

45.6 KB Created: 2020-08-22 20:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbe7bfdaa86eb1f6e02251fb83235ed0 SHA-1: 5b14427068f516b0d2a768752844185ac85e11bc SHA-256: 9f7b7aab43ef1b765814cf307db4fede2627e81d5b7b9336b9138de765f9d349
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, https://ttraff.cc/pify?keyword=combustion+and+flame+extra+question+answer, leads to known malicious infrastructure. The file also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on Shopify. The ML classifier 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=combustion+and+flame+extra+question+answer
    • http://files.sisterspiritwomensharingspirituality.org/uploads/1/3/2/8/132815154/58853863.pdf
    • http://jazaxop.thepowissettgroup.com/uploads/1/3/1/3/131379685/gefuzokuminarukarof.pdf
    • http://files.tvchsa.com/uploads/1/3/1/4/131453193/7006613.pdf
    • http://fujadozu.vanessamariedewsbury.com/uploads/1/3/0/8/130874493/4463587.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/30880403303.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8816/files/12532216685.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/39305943817.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/sapuzotejil.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/gajirapika.pdf
    • https://cdn.shopify.com/s/files/1/0434/4669/8146/files/apna_time_aayega_lyrics_in_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/36582546425.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/indesign_free_trial.pdf
    • https://cdn.shopify.com/s/files/1/0435/3720/3364/files/96919837344.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/magugememubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/imdb_barney_s_adventure_bus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f29.bin
d172f430fa593d6233e80e4c3ee6a1d4fc3dcb8374f98a662eacd948eccf4325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F29 5384 bytes
font_01_sfnt_off0000716f.bin
d0332d07ea0d572e955305bf5d1c3768884fc6ad882466be72d638056fbe2572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716F 10012 bytes
font_02_sfnt_off000093ee.bin
107dd7461bad0ee7f69ec232d7edbfa51533cbe03462e0930b0bd999c9024e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93EE 16152 bytes

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