Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de428b60558781f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-09 11:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e259b60dcdf3e01a48a1ab1a75848ef6 SHA-1: 9da1c6cc6c5bd68972abc56bf929e8469f18efc4 SHA-256: 0de428b60558781f5969813419d172e4b4ddc4ebda7405941d57bdda487b3e17
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The presence of a "download button" heuristic suggests a social engineering lure to trick the user into clicking the malicious link. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=boring+bored+exercises+pdf
    • http://vawop.coffeekilimanjaro.com/uploads/1/3/0/8/130873995/dofat.pdf
    • http://files.drrichardsonsnfp.org/uploads/1/3/1/3/131380469/8283429.pdf
    • http://files.makeupartistanastasia.com/uploads/1/3/1/4/131454024/1d8964.pdf
    • http://kejefifu.aripreservationtrust.org/uploads/1/3/2/3/132303382/dutaves.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3464/8482/files/xizufesewevoduralolazemu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9743/8875/files/96116054869.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/kenworth_8_bag_air_suspension.pdf
    • https://cdn.shopify.com/s/files/1/0452/5791/6578/files/scanned_to_editable_word_converter_online_free_without_email.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/norixugurexejim.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/kidege.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/nisibet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7342/0965/files/12599916351.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4682/files/6501829009.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/18147291927.pdf
    • https://cdn.shopify.com/s/files/1/0428/7650/2175/files/kuganunoxofogowodubuvuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3092/0871/files/32089243746.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/xavukufuputekojula.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_off00005c3e.bin
c88d190981b54930b2dde3adaa2233820fd465bbbedb2157eb808ec60105d3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3E 5336 bytes
font_01_sfnt_off00006e7e.bin
813dd391c0d3b651cd8b4f4d09a9c8a134dfe311f88694bbe9304a374ce61676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7E 10088 bytes

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