Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc057faacf5fb50…

MALICIOUS

PDF

43.6 KB Created: 2020-08-14 10:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a3ba4de384193983fed11329160b6be SHA-1: 59630c1b45f837172e482004b6f815c63f95f428 SHA-256: cbc057faacf5fb50b7644c300bfb31a385584e04583a46aa307a3d7eb90d1367
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious URL, https://ttraff.ru/wb?keyword=psm%20exam%20questions%20and%20answers%20pdf, is identified as a malicious redirector. The document body, though heavily corrupted, contains text suggesting it is a lure for 'psm exam questions and answers pdf', likely to entice users to click the malicious link.

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/wb?keyword=psm%20exam%20questions%20and%20answers%20pdf
    • http://liragoz.baypowerengineeringltd.com/uploads/1/3/1/4/131452958/nuxes_zanapu_notakilikito_nipukoze.pdf
    • http://files.devereuxazevents.org/uploads/1/3/1/1/131163643/1af510cdac3b33e.pdf
    • http://files.dawnuskennels.com/uploads/1/3/0/7/130775126/powimedizawejel.pdf
    • https://cdn.shopify.com/s/files/1/0452/5362/3970/files/84014655448.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6437/files/95185315466.pdf
    • https://cdn.shopify.com/s/files/1/0438/0511/4528/files/algebra_worksheets_grade_8_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/45064403974.pdf
    • https://cdn.shopify.com/s/files/1/0454/6196/2910/files/rafadewexixalezumik.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/zuzuwavojenepur.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0918/files/theory_of_biogenesis_and_abiogenesis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9000/files/zilodetazivobejuxapejusov.pdf
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/masters_preliminary_exam_routine_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/13323128555.pdf
    • https://cdn.shopify.com/s/files/1/0437/9328/5277/files/22974298158.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_off00005bf7.bin
37afbc8787a41cc35b1cd21fbaa3a798c59c3bd7a1df2b46deaa3637e8de883e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF7 5324 bytes
font_01_sfnt_off00006e01.bin
1c45029e24eb4209958669b4af2afc49506897ead1f8887f10598e70f79a4786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E01 10956 bytes
font_02_sfnt_off0000937b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x937B 4324 bytes

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