Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbb3acaae41f974…

MALICIOUS

PDF

33.8 KB Created: 2020-08-21 09:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24da09365dd69353fbf0c7b0d29bbfa8 SHA-1: 5cb58d7efa4e194b9cde4623009906254d62c4b1 SHA-256: 5fbb3acaae41f974df60898639f71f858a694bc8fc9e3556e1b3616cdfe677fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious link identified is https://ttraff.com/pify?keyword=harmony+hall+piano+sheet, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious sites.

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=harmony+hall+piano+sheet
    • http://najezox.baltimorebotanicals.com/uploads/1/3/1/4/131452861/jipozarirewim.pdf
    • http://files.countyparkfriends.org/uploads/1/3/0/8/130814279/zobisulit_selitiga_sojinotavom.pdf
    • http://files.nwextremeoutfitters.com/uploads/1/3/0/7/130775825/2005805.pdf
    • http://litejab.pallavisastry.com/uploads/1/3/0/7/130738730/756933.pdf
    • http://xafamow.msfallspoint.com/uploads/1/3/0/7/130738731/4303809.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2442/2811/files/inline_block_css.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/my_talking_angela_mod_apk_revdl.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/blasphemous_collectibles_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/seperami.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/essential_of_biochemistry_by_satyanarayana.pdf
    • https://cdn.shopify.com/s/files/1/0434/4309/3660/files/double_entry_accounting_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/sebas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/irving_berlin_blue_skies_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/4576/4770/files/nova_bncc_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/45937190568.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/fafebilovegusuposu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7694/3000/files/zopakazapidegamilopiguze.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/kubijubulipago.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7526/files/94712396355.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_off0000489e.bin
29d110a34a34f7ae5ace52f879949190d1e90f8f23c761412122a3ca29f00cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x489E 5124 bytes
font_01_sfnt_off000059dc.bin
19b7d5941b669a0fe447dca77251e29d36d290f0af593c9795ab555dd2758e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59DC 9444 bytes

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