Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc515a679776f7d6…

MALICIOUS

PDF

47.6 KB Created: 2020-08-27 22:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d993927014566097c12c771818e347ed SHA-1: 47222d038ceeb70a36d8437b08bc459cab87e8f4 SHA-256: cc515a679776f7d687c0d2277ca13aa10b06ffc1a26875461f1b4de28f2463b6
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to host SEO-optimized PDF documents. One of the primary links redirects to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious redirector URL and several benign-looking Shopify URLs, likely intended to mask the malicious activity.

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.com/pify?keyword=perspectiva+conica+con+dos+puntos+de
    • http://gejiri.robbatesphotography.com/uploads/1/3/1/4/131406390/83fc7d50e.pdf
    • http://files.sweetcelebrationsllc.com/uploads/1/3/1/3/131380063/1772054.pdf
    • http://files.keyahealth.com/uploads/1/3/2/7/132741476/5002980.pdf
    • http://files.mfra.ca/uploads/1/3/1/3/131383493/02107d7c48ebb8f.pdf
    • http://files.scotskirkparis.com/uploads/1/3/0/7/130738889/mazagisu_fixepomujav_pebofadazaka.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/child_development_13th_edition_john_santrock.pdf
    • https://cdn.shopify.com/s/files/1/0462/2663/6954/files/custodian_worker_1_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/20111590912.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/norma_astm_a351.pdf
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/liruzifisaseso.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/stand_up_speak_out_talk_back.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33540287451.pdf
    • https://cdn.shopify.com/s/files/1/0436/0211/6772/files/angular_2_tutorial_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/pupefuvunomipotusiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6359/files/42248034202.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0663/files/arya_2_movie_dialogues_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/13225560933.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_off00007252.bin
15d010b9e97fae9270cbc159b0f77d8cc06f75c41738d3e5d41d797aa7991035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7252 5096 bytes
font_01_sfnt_off000083a6.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A6 1800 bytes
font_02_sfnt_off00008c34.bin
c40d678f18a4fdb98218363803215ab2d279bb28d63ef3e97acac9c1b85b3240		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C34 10640 bytes

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