Malicious PDF — malware analysis report

Static analysis result for SHA-256 698b25273524248a…

MALICIOUS

PDF

46.3 KB Created: 2020-08-22 04:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8651238f10b92a01ba6fb917467cf4b5 SHA-1: e4b0e48df0e57ec1af0a73b5cb2089d842698a1b SHA-256: 698b25273524248a94ec96fb3e904aa845a86b9b53217e16661e1fdd0af2f255
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=past+simple+questions+exercises+elementary+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external content. The presence of a 'download button' heuristic further supports the attack pattern of social engineering users to click malicious links.

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.com/pify?keyword=past+simple+questions+exercises+elementary+pdf
    • http://fosajuzow.hannapachman.org/uploads/1/3/0/8/130813714/gekugosezobajavez.pdf
    • http://files.salmansoz.com/uploads/1/3/2/6/132683252/1187716.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/xadewatulefikutabusad.pdf
    • https://cdn.shopify.com/s/files/1/0433/3977/6159/files/mechanism_of_action_of_atorvastatin.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/38624202027.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/junonabobeludoduparanuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3177/9733/files/73794772378.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/wanejijekujedaporef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/65240939819.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/b_l_theraja_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/fowubigu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/rekajunulediduka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9334/4924/files/zutizi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6973/files/69484568948.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/36650970609.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_off000069a5.bin
e57d229599c62f836a9f99f07721249946ad5c38c09efd004a5d57ae78c7a6ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A5 5480 bytes
font_01_sfnt_off00007c35.bin
90b362ff6c00dce8bd975592b3727e9ca178e987ff38aa4a2e1d0b5473cffcbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C35 9948 bytes
font_02_sfnt_off00009e35.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E35 4324 bytes

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