Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ceba3759f228891…

MALICIOUS

PDF

38.0 KB Created: 2020-08-27 19:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c417fc355066f3ebc9ea940f7ac60633 SHA-1: b460a46871777048048ea904c6eb2b4ac072cc84 SHA-256: 6ceba3759f228891f463e3c9c9e3266b5f2e344dc747cab6cff4fb73806677bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to appear as 'China dynasties of power worksheet answers' but redirects to a malicious URL. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely to manipulate search engine results and obscure the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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.club/pify?keyword=china+dynasties+of+power+worksheet+answers
    • http://files.useyourgift.org/uploads/1/3/1/4/131408942/jolifuver-ruxexiwixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/dukezazuvoniwowobo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/edit_documents_freeware.pdf
    • https://cdn.shopify.com/s/files/1/0429/5029/5708/files/managerial_economics_mark_hirschey_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/context_clues_worksheet_for_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/basics_of_electrical_engineering_ktu.pdf
    • https://cdn.shopify.com/s/files/1/0463/1766/6461/files/90522785194.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/bodiripigunufigi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/76114184327.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/19953835769.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/46731219562.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/zugufan.pdf
    • https://cdn.shopify.com/s/files/1/0447/2373/2636/files/aquaculture_journal.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/74058801130.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3786/files/divurupiwatuxekamad.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b00.bin
6789826d531cc4e49bffbb8be9be853324178379f369f4332d176cd548f24413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B00 3360 bytes
font_01_sfnt_off000056f6.bin
67054756788cba5309b8a02535286e6901b44fd846fdf5da9defdd681a6b7ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F6 5260 bytes
font_02_sfnt_off000068e3.bin
4eec8f7cfc39c83f94f5af737e7d9c8046b866278e83e614bf6c26436e27d637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E3 9904 bytes

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