Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a75592bf08df05…

MALICIOUS

PDF

59.6 KB Created: 2020-08-05 16:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d6e04e1238dbca61e4fd57ff38ff63d SHA-1: 3b4c38f53da06de0da16e8f460e302476fe005a2 SHA-256: 14a75592bf08df0549beeb4c394461f59ba9a40462f3e16640aa40e3bebd2552
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'block matrix inverse pdf' and includes the malicious URL. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.cc/pify?keyword=block+matrix+inverse+pdf
    • http://files.seymourpossibilities.org/uploads/1/3/1/3/131381605/6085910.pdf
    • http://files.connectexperiencewrite.com/uploads/1/3/0/9/130969206/8267770.pdf
    • http://files.cookwithjames.com/uploads/1/3/2/3/132303010/sogudakinilolar-sulisisetujif-betif-nurojezazapafi.pdf
    • http://files.activesundays.org/uploads/1/3/1/8/131860204/202eb732d5777f.pdf
    • http://files.methowvalleypsfa.org/uploads/1/3/1/0/131070911/zekewebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/lebawekosarabuwopali.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/muxorabivafegoxaxijodek.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/79419307585.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/89402931475.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/pakologodeti.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9295/files/attitude_scale_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4711/5157/files/22497598179.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/42nd_amendment_act.pdf
    • https://cdn.shopify.com/s/files/1/0439/0407/3880/files/83962633208.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/78436439843.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/bank_name_full_form_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/23961346043.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079f7.bin
477301f9977f753cc35e5ef55417933f6270d82c963a1b32c9f48372daed4145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F7 5332 bytes
font_01_sfnt_off00008bfc.bin
6215a9bccf5f35b75039cf82a91ffaa093568ed1feb8fe95c7b4f323153cdc0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFC 15604 bytes
font_02_sfnt_off0000bc5b.bin
81414644a2b04da35792b5ed096d60653fb9978e29cf8e765c557d33b2308b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5B 16556 bytes
font_03_sfnt_off0000d2e0.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 4324 bytes

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