Malicious PDF — malware analysis report

Static analysis result for SHA-256 8636072a4f884958…

MALICIOUS

PDF

35.0 KB Created: 2020-08-03 14:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9589967a5b9b343b29e353556149e4 SHA-1: 26323410dfc5cc7af1252b49cf6c7fda37acf912 SHA-256: 8636072a4f884958043a215500006112f1d5c161c3f638fc90820c2990a70cb5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to manipulate search engine results or distribute content via numerous links. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=advanced%20computer%20architecture%20parallelism%20scalability%20programmability%20kai%20hwang%20pdf
    • http://files.neighbors4christ.org/uploads/1/3/2/7/132712096/xevegigumo.pdf
    • http://files.naacpaustin.com/uploads/1/3/1/3/131379894/4441134.pdf
    • http://files.electroyelizondo.com/uploads/1/3/1/4/131438523/1482951.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6354/9845/files/gibijijidiketobisix.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2114/files/netfl_c4_b0x.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/wowagixupugawegij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejozetopugewafapo.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/neir_automata_mods.pdf
    • https://cdn.shopify.com/s/files/1/0431/4516/7008/files/golapijukojon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/42536593771.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/refx_nexus_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/internship_survival_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/63197057161.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/mamexawobapigevopad.pdf
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/wemek.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/71196802453.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/unlz_gba_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/dezuriwevirudetijogisi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004950.bin
2336874272609b059c091efc277fef601c114499a5edfd00555974bba19d1a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4950 6016 bytes
font_01_sfnt_off00005db9.bin
05f0b31b341eb3c64ceb514b960897ff93573b0de0a0a5a0ced4702e8229b051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB9 9516 bytes

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