Malicious PDF — malware analysis report

Static analysis result for SHA-256 82499bb168dad18a…

MALICIOUS

PDF

45.5 KB Created: 2020-08-18 14:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 086e8bcdf95150954fb07fdf8a48f3f1 SHA-1: 3d832e672711bb2d997a28db65d346842cdbe010 SHA-256: 82499bb168dad18af65942a3cbbfd9990a7111790d1e4e4281e95110fc2a4a01
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One prominent link redirects to a malicious domain, ttraff.cc, disguised as an educational resource. This indicates a social engineering attempt to drive traffic to malicious infrastructure. 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/pify?keyword=integers+worksheet+class+6+pdf
    • http://files.katrinamitten.com/uploads/1/3/1/4/131406780/b63c75ee288f817.pdf
    • http://files.livingsilverspring.com/uploads/1/3/1/3/131398145/kikezosizofav.pdf
    • http://jiradato.jcsualumnidc.org/uploads/1/3/1/0/131070374/fe31826c7.pdf
    • http://files.carockart.org/uploads/1/3/0/8/130813979/32d65a0872d9814.pdf
    • http://totase.libertyhighschoolorchestra.com/uploads/1/3/2/6/132680813/ddd8973b6f8e0.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/fanupububomixiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/doxerofebidopap.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/36691103155.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/pujokepagixepudusemon.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/62544684337.pdf
    • https://cdn.shopify.com/s/files/1/0433/3466/4347/files/57224546074.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9797/files/discord_text_color.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/the_routledge_handbook_of_audiovisual_translation.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/interventional_cardiology_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2821/files/jurnal_cacing_pita.pdf
    • https://cdn.shopify.com/s/files/1/0429/3266/6524/files/club_penguin_member_code.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fe.bin
81e400d5e86d3d41c7c3c423a52dfab270d94f3b56ae2ace088848e9ae1931dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 5404 bytes
font_01_sfnt_off00007765.bin
8ca841167459293232d1c88e0009358a701e9f09cb79c8a5c7a7e26043ee7e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 10380 bytes
font_02_sfnt_off00009ae9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE9 4324 bytes

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