Malicious PDF — malware analysis report

Static analysis result for SHA-256 681c9df1af71eded…

MALICIOUS

PDF

69.0 KB Created: 2020-08-19 18:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f2ff655e24cd6d46ca698090db1d1b8 SHA-1: 01a5d3f30df22ed0840179aacfc4dcdfae4d2b35 SHA-256: 681c9df1af71eded732d0cd632e94098c44d7ddfb401fe9ac4b1389658a9392a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links, 'https://ttraff.ru/pify?keyword=ayat+ruqyah+syariah+pdf', is flagged as a malicious redirector. This suggests the document is part of a link farm designed to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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.ru/pify?keyword=ayat+ruqyah+syariah+pdf
    • http://sedopir.thehistorianinthegarden.com/uploads/1/3/1/4/131453247/25a4ba.pdf
    • http://files.una-orlando.org/uploads/1/3/0/8/130873830/zitabigif.pdf
    • http://files.thegardentoronto.com/uploads/1/3/1/6/131607075/9537803.pdf
    • http://faguv.indigartmildura.com/uploads/1/3/1/4/131407089/443f0f6bb4.pdf
    • http://files.lacalendasb.com/uploads/1/3/0/9/130969220/pigozenewek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/51820504321.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4189/files/72921966706.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/fokut.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/all_affidavit_format_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/0056/8736/files/o_alienista_em_quadrinhos.pdf
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/past_tense_irregular_verbs_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/fatidi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/miwoxenikopivufagusidawef.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/insurance_company_annual_report.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000d45e.bin
665bd3171105c5a9689cd5041128494c071b3123fa4e78166f9d2cb2a0845e51		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD45E 28180 bytes
font_00_sfnt_off00009d7d.bin
43ab0fda3c250ce86f896249e71f6e5cc8d1477eec488b0ca4799a5f8289d8e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7D 5312 bytes
font_01_sfnt_off0000af93.bin
4b2aadf9c0d62f10092837b9f0e26bfee03cca6b683c134882195c7013756850		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF93 11176 bytes

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