Malicious PDF — malware analysis report

Static analysis result for SHA-256 6161f1a86c34eec6…

MALICIOUS

PDF

54.2 KB Created: 2020-08-11 14:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 153daad080be0377c0085bf61985092e SHA-1: a6743575a1d54b199bf575929f6dbc6f9ba6d65c SHA-256: 6161f1a86c34eec67eeb38f890cf079d16eb95b41f82f9858d5dd1e9152a57fd
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=supervisor+behavioral+interview+questions+and+answers+pdf' which is flagged as malicious. This suggests the document is designed to trick users into visiting malicious sites under the guise of providing interview-related content.

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=supervisor+behavioral+interview+questions+and+answers+pdf
    • http://zejowa.hello2kitty.com/uploads/1/3/1/1/131164250/dorumafularudo.pdf
    • http://files.kansascityamprepair.com/uploads/1/3/0/9/130969146/7d7fa7.pdf
    • http://files.affordablehomecleaningservice.com/uploads/1/3/1/6/131606291/b4e27333.pdf
    • http://files.do.mrazamerine.com/uploads/1/3/1/3/131382078/1890996.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/juvufejurik.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/zokufobunisuxowewev.pdf
    • https://cdn.shopify.com/s/files/1/0452/1613/7376/files/82448817593.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bizem.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/57948861718.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/28569401645.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/gobomifopate.pdf
    • https://cdn.shopify.com/s/files/1/0438/2919/8998/files/gmat_official_guide_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/33688039191.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8912/files/ruputinozotevoweneg.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/43217466035.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_off000067b0.bin
165c7741080294203ae2fc7756161c90e1a493f9199a2c3d6462fdf95902da4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B0 5532 bytes
font_01_sfnt_off00007a71.bin
c72c034d3ceb966cd3a9d0267f768790c8e06328c5948964c2b57cdd8bc69b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A71 1924 bytes
font_02_sfnt_off000083a9.bin
a3d85e9a1792cbe60de9c2caf119d0e720c2764c6c35d0a0f6aaa16991f0adce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A9 10108 bytes
font_03_sfnt_off0000a635.bin
a8b0c25172aa9b5bc08eee067abf1650770238587142d73506cc124324baa444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA635 16436 bytes
font_04_sfnt_off0000bc3c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 4324 bytes

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