Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f640602e7a00c14…

MALICIOUS

PDF

45.6 KB Created: 2020-08-23 22:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75eeb13128eed1dc1de345aa3a4216e4 SHA-1: aead2ce38b12543b9aad46d4472bdecfc0410fe1 SHA-256: 6f640602e7a00c14d39eea89cf8ca91a6eb46ccee5ebf4c26e9da36c1662611e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=aankhein+teri+kitni+hasi+whatsapp+status, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=aankhein+teri+kitni+hasi+whatsapp+status
    • http://files.skmusicboosters.org/uploads/1/3/1/3/131380728/40bc57e2dcdb.pdf
    • http://files.hypnobabiesboston.com/uploads/1/3/2/6/132695586/nigidigukirek.pdf
    • http://files.discoverhispresence.com/uploads/1/3/0/8/130874058/7867916.pdf
    • http://files.richlandarts.com/uploads/1/3/1/4/131406453/e49a71c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/2061272534.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/25700935610.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/gijixometopadipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0435/5581/5583/files/doraemon_cartoon_free_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/sodevubuvoxidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tizisixurodegu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0870/files/76208820364.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/61291058345.pdf
    • https://cdn.shopify.com/s/files/1/0435/3028/9311/files/17183638038.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0298/files/aptoide_apk_indir_android_oyun_club.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b58.bin
5260aa1b2348d1624af25b42df195698dba3595dbfd1d32a322b2e1a3e84285a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B58 4792 bytes
font_01_sfnt_off00005b94.bin
9812099c5b295b859b411b79c63ef0f3e15cad7fffbe3efb0a8bc6b6c1165317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B94 2044 bytes
font_02_sfnt_off00006500.bin
68b1654bdc7bb9d8849d66802e698f2ae7fd2bc668be968242f42ace08be94fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 9564 bytes
font_03_sfnt_off000085e4.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E4 16060 bytes
font_04_sfnt_off00009a7a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7A 4324 bytes

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