Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2be940e4b369bb1…

MALICIOUS

PDF

40.2 KB Created: 2020-08-07 18:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a0bf06ffde44fc425e4b928a14f14fb SHA-1: cfbf2b7911d8df7ea4948a085445fc8798d9a863 SHA-256: b2be940e4b369bb17a268e4b05a7c97590101713e66697977918a6d75ab65afe
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to ttraff.ru. The document body, though heavily obfuscated, contains text related to 'causative verbs exercises with answers pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of numerous other PDF links further indicates a link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=causative+verbs+exercises+with+answers+pdf
    • http://files.wfgcompass.com/uploads/1/3/0/7/130775750/simonalovivu_sevexisido.pdf
    • http://files.duffysdelivers.com/uploads/1/3/1/6/131606480/7128549.pdf
    • http://parexagag.nohsfamily.com/uploads/1/3/2/6/132681670/3522570.pdf
    • http://files.brickalleybistro.com/uploads/1/3/1/4/131438423/vemewapazinoxaz_fopasapumativi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/95923314969.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xajubebajodefemun.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4679/files/official_boyfriend_application.pdf
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/gasofosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/77430427463.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/begilaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/20824618214.pdf
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/40407939728.pdf
    • https://cdn.shopify.com/s/files/1/0436/6086/9785/files/allahabad_university_ma_english_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/29243101351.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/jasokasivu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/rolling_stones_500_greatest_albums.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005be1.bin
97b27ebe0463179a6fdfaa10a9ebea3a60005f102eaea10b93950f8f867be04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE1 5476 bytes
font_01_sfnt_off00006e91.bin
235267666f73f364cdb717947389ca863591d90f28cf8c97258a462e90cc9dcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E91 10900 bytes

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