Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4568d702943c3e…

MALICIOUS

PDF

54.7 KB Created: 2020-09-23 20:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33db1e621a2c48dcc4359e5faa21bf20 SHA-1: 4b15b34f319f03903137ada09b888520483e3061 SHA-256: bd4568d702943c3e3ac7c7be6c506f2417bc6a0b77e74524847d033bcd8dc544
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a review for basketball shoes. It also functions as a link farm, embedding numerous links to benign PDFs, likely to improve its search engine ranking or to mask the malicious link. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms a high likelihood of a phishing or malware delivery attempt.

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.link/wix?keyword=starbury+basketball+shoes+review
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/medical_sales_representative_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0958/0961/files/official_chess_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/avenza_maps_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0853/files/4-_pole_manual_changeover_switch.pdf
    • https://8d61d65e-6aa8-419c-84cf-0ebba38f7b69.filesusr.com/ugd/73f3b0_173fc34fa72c41acadfcc6ca6bc5b18a.pdf?index=true
    • https://07287304-fef4-4398-be8a-a6f63e65601e.filesusr.com/ugd/3bca44_2888e4f44b5b439faef5042570a15f36.pdf?index=true
    • https://3a80c38b-7c39-4754-9a81-0e77abc4835c.filesusr.com/ugd/2f3216_bb04414ca07c4205befd916664fa4025.pdf?index=true
    • https://533f90cd-b539-4ce5-9a68-80ff25a6dfca.filesusr.com/ugd/ffcbea_8b38cc5501714c2b8d405442438de808.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0484/1016/5408/files/fl_studio_11_producer_edition_full_crack_download_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/kunomewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2045/files/46748303427.pdf
    • https://8d61fb16-7d85-44d8-9511-de5a0e243f35.filesusr.com/ugd/a58502_320c9d6f88f04567b2d7f8bda09b6dcd.pdf?index=true
    • https://b8dd4710-84d0-4a51-b189-d7795c0130ef.filesusr.com/ugd/77eba6_e8adea398dc14d1195dcaf51ca94cb9f.pdf?index=true
    • https://15b7b9dc-2b62-4399-8519-55991a1f0e45.filesusr.com/ugd/ab059d_5e0bafd9327845849083faa1600d1162.pdf?index=true
    • 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_off000096ed.bin
105633c449157353573d40d6c57b77e646889a827090e1b5fc1f25420ba5b435		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96ED 5336 bytes
font_01_sfnt_off0000a923.bin
98b7cbb9784b01e7172d89ae3add7fc8473112a9e3114d4f0ff18db817675185		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA923 10696 bytes

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