Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd82bb803ab1884f…

MALICIOUS

PDF

45.9 KB Created: 2020-08-24 05:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09bd5da90c2977b24d50dd0f96c24245 SHA-1: 9b20a6fefcb78c29302c3a21e7dd3c9c7ce3f575 SHA-256: fd82bb803ab1884f916e620799426de71fb2db596487bfe247914232655f1c2a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm with numerous embedded URLs, including a critical redirector link to ttraff.ru. The document body, though obfuscated, contains the phrase 'Interdependence of organisms crossword puzzle answers' and the URL that triggered the redirector, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious.

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=interdependence+of+organisms+crossword+puzzle+answers
    • http://files.mrsscharnhorst.com/uploads/1/3/1/3/131398010/bimisibadivi-bipade-lifobojulube-gawolexugadol.pdf
    • http://movomug.txstatebap.com/uploads/1/3/0/8/130874277/tuzat-kepajefupe-danasenavef-gunixovu.pdf
    • http://zuraj.tolumorawo.com/uploads/1/3/1/1/131163774/jasid.pdf
    • http://files.aureliotobias.com/uploads/1/3/0/7/130740391/wolagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/43216077600.pdf
    • https://cdn.shopify.com/s/files/1/0452/1204/1367/files/57283043720.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/tewalaniwipodapozetez.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4800/files/zufapo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/reading_eggspress_placement_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/37407324174.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/31376817920.pdf
    • https://cdn.shopify.com/s/files/1/0433/9476/0862/files/83318332642.pdf
    • https://cdn.shopify.com/s/files/1/0434/3539/3180/files/jexoruvutol.pdf
    • https://cdn.shopify.com/s/files/1/0432/3354/2303/files/libro_cardiologia_guadalajara.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8505/files/37823760479.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006719.bin
042e263d2b9a247e237c35a1bf8abdcc021fa913534856460e12a27e64a067ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6719 5436 bytes
font_01_sfnt_off0000798b.bin
5662ca07f9d36a35ca46301dd86eb5b0ec340bf7c47bad4684cd331632f5d8dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798B 9948 bytes
font_02_sfnt_off00009b8d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B8D 4324 bytes

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