Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8b30e3b7ad7df4…

MALICIOUS

PDF

49.1 KB Created: 2020-08-11 05:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d1a53d0ce52e589a2545be6462468a SHA-1: cb16f43aba5af4c58afd2c2ca92412deb6a079a6 SHA-256: 6d8b30e3b7ad7df43bce871b3785bb87078c46ca2769ff21d17cbeca60ed2ad3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a critical heuristic firing for a malicious redirector, indicating an attempt to lead users to harmful content. The document body, though malformed, contains text related to a 'free download' lure, reinforcing the malicious intent. The primary IOC is the redirector URL which is likely used to serve further malicious content.

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.cc/pify?keyword=communicating+in+business+english+pdf+free+download
    • http://files.maryellendearstyneantiques.com/uploads/1/3/1/6/131606630/c60f8e27ddcc.pdf
    • http://files.ugawif.org/uploads/1/3/0/8/130874060/vuluzixipepodu.pdf
    • http://files.youshouldvisitjapan.com/uploads/1/3/0/8/130814106/611555.pdf
    • http://ronaw.ummahcharms.com/uploads/1/3/2/8/132814930/mosaposudopu_woluna.pdf
    • http://files.indianacoal.com/uploads/1/3/0/9/130969470/gavojudiwuz_wibavura_vusuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/85082721048.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/ielts_academic_writing_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/4224/9621/files/bsa_activity_consent_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/13708788306.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/78865948752.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/cephalometric_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/51379592859.pdf
    • https://cdn.shopify.com/s/files/1/0428/1614/3526/files/bled_orthographe_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6173/8662/files/ruu_apbn_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/73611942846.pdf
    • https://cdn.shopify.com/s/files/1/0435/3005/9940/files/books_about_time_management_for_students.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_off000070f8.bin
a02a8c4846f3c78377669db8ab77716fa1467c41f30afb39cc1b4a68c5e6c28c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F8 5708 bytes
font_01_sfnt_off00008441.bin
de84a1ee50a1457d47acd7bd72fbc9f83d6799f2e3df3dec798db34cc42ec4c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8441 10640 bytes
font_02_sfnt_off0000a895.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA895 4324 bytes

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