Malicious PDF — malware analysis report

Static analysis result for SHA-256 67788ce2aa355be7…

MALICIOUS

PDF

65.4 KB Created: 2020-08-06 10:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64ac3d3347b33baff57ca2476af1b876 SHA-1: a70929a7772a28ffd41122696a57185717aa5249 SHA-256: 67788ce2aa355be7c3ff9d47aaf5db3b6dfbad8f6f18145f7c5db921ab7a655e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are algorithmically generated and point to external PDFs. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/pify?keyword=bhagavad+gita+chapter+17+slokas+in+sanskrit+pdf, which likely serves as a gateway to further malicious content. The ML classifier also strongly indicated maliciousness.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=bhagavad+gita+chapter+17+slokas+in+sanskrit+pdf
    • http://files.aretelandscape.com/uploads/1/3/0/7/130739274/5247708.pdf
    • http://files.kofc10627.org/uploads/1/3/1/3/131384713/perigimim.pdf
    • http://files.farmacybotanical.com/uploads/1/3/2/3/132302973/xutitogesafa-lixoreriberexik-larowuwonubola.pdf
    • http://files.thecarluccishow.com/uploads/1/3/0/8/130814101/wejobobuzosug.pdf
    • http://files.scienceeducatorsforurbanschools.com/uploads/1/3/0/7/130739598/bazekejaruzuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/kagapituwobawivamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/33037215825.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/26213681137.pdf
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/physical_chemistry_tinoco.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/88646581039.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0141/files/59551228428.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/43157083007.pdf
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/zetokijovegizawajoru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/11899217046.pdf
    • https://cdn.shopify.com/s/files/1/0432/9570/3204/files/unity_zelda_clone.pdf
    • https://cdn.shopify.com/s/files/1/0434/1674/8188/files/gubuvet.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
font_00_sfnt_off0000870d.bin
9559fb366c80804547c3af56c3c40683e41522c97bfbd93e998021a639e1ed3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x870D 5724 bytes
font_01_sfnt_off00009aa3.bin
8e363f7c04a78fe8763b9421f35460dda1238e7ef61c94b58b4c850364eba173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA3 16308 bytes
font_02_sfnt_off0000ca79.bin
79f67001ba336fd6d159e2ce7b8ceb312d01c4f5cdb7c2d61e171d4c42dedb5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 15004 bytes

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