Malicious PDF — malware analysis report

Static analysis result for SHA-256 19814c84b6e74be4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-14 12:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abcdbfe4a99c0f5c8aa3784c09da8026 SHA-1: 686b046b5d5c329999bcd2fd859bf5f6a989a3c5 SHA-256: 19814c84b6e74be4fc37b3966b68a818eb09633ad921c372ced6b062dfa48fb2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. This suggests 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/wb?keyword=marantec%204500%20manual
    • http://files.treecave.com/uploads/1/3/1/3/131379844/norakog-wuzilodejivorim.pdf
    • http://files.ghanaedcollaborative.org/uploads/1/3/2/7/132740619/6281582.pdf
    • http://files.denveroddd.com/uploads/1/3/1/4/131454172/3213668.pdf
    • http://files.f1rstgen.org/uploads/1/3/0/7/130775046/vezukunavexe-xonezo-zadov-vuxirowani.pdf
    • http://pimip.bluepeterboathire.com/uploads/1/3/0/7/130738714/sodejotadexikakut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/41943506998.pdf
    • https://cdn.shopify.com/s/files/1/0434/1936/9639/files/types_of_roller_bearings.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/remove_last_commit_from_github.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdf
    • https://cdn.shopify.com/s/files/1/0432/1715/8312/files/loxamotax.pdf
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/firefox_developer_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/78111700280.pdf
    • https://cdn.shopify.com/s/files/1/0428/2990/6079/files/raxugerulerapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/pijegebutamozavunabug.pdf
    • https://cdn.shopify.com/s/files/1/0452/3737/1037/files/definition_of_bank_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/gofonokiwikogasiredajizug.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/scrabble_two_and_three_letter_words.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_off00005c95.bin
8e7def814b45b23cd03559cc6d9a8eefce50dc60b55c3951b37cb034158ef6e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C95 5128 bytes
font_01_sfnt_off00006df5.bin
88278a6a4d4eb9224502a2984837431f21b5a916bbf11a18f7032d0711eccc50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF5 13924 bytes

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