Malicious PDF — malware analysis report

Static analysis result for SHA-256 666ab40918505ec1…

MALICIOUS

PDF

41.4 KB Created: 2020-08-23 03:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abd34905e11f69b26475f784affab751 SHA-1: f7a0eea8728a9de3c884bef17f8235a0170cf0bf SHA-256: 666ab40918505ec1f87af25d40541042e771b4c059adb53886d4093565fee9b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure users to malicious sites, likely for phishing or malware distribution.

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=letter+f+template+printable+free
    • http://files.cocoaandspice.com/uploads/1/3/1/3/131380063/vuzapubufedaso-jipowewijola.pdf
    • http://files.kimanidolls.com/uploads/1/3/0/8/130874253/gobapanine-rodetokoxun-gowubidawis-fosufopodumojo.pdf
    • http://files.dandowland.com/uploads/1/3/0/8/130813841/mixutebavi_wigikoxupu.pdf
    • http://wopigom.aikidoinstitute.org/uploads/1/3/0/7/130738732/5351981.pdf
    • http://fawupeko.ic-english.com/uploads/1/3/2/7/132740623/potewobeba_xebubeketifi_zuvidel_pinasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0790/0835/files/jizuwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/semasulozuza.pdf
    • https://cdn.shopify.com/s/files/1/0463/1884/6112/files/endless_frontier_meta_progression_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/28148669624.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2753/files/tival.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6437/files/letter_format_for_promotion_application.pdf
    • https://cdn.shopify.com/s/files/1/0450/3673/2566/files/muxezoseselijebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/3229102518.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/assassin_s_creed_1_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5975/files/82911148360.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/8554264674.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/tejozoxomijomoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5139/2922/files/62038502146.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_off000064da.bin
6e549147b71b4bc30bd2b878ee6b5262d5b8ea24cd436005a43883f9a5988a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DA 4948 bytes
font_01_sfnt_off00007594.bin
99e2653c5e260ef29c45d732dd04e48f970e121bce5eda0ca41c15ed82fab3d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7594 10172 bytes

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