Malicious PDF — malware analysis report

Static analysis result for SHA-256 880266cddaf2252e…

MALICIOUS

PDF

45.1 KB Created: 2020-09-17 11:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fa7869518e5a2900c5f45ab3c5fe8cc SHA-1: 9148fcc40b90ba930bf778491d84ccb11a0a263c SHA-256: 880266cddaf2252efdd79b94dd59eeff4f2cf5fd8cf4754b4b8b79872b5905df
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is designed to lure users to malicious sites. The document body, though heavily obfuscated, contains text related to 'University park elementary school irvine' and the malicious URL, suggesting a social engineering lure. The presence of numerous external PDF links, many pointing to benign content, indicates a link farm strategy to obscure the malicious redirector.

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.me/wix?keyword=university+park+elementary+school+irvine
    • http://jigam.myrainforestpets.com/uploads/1/3/1/4/131409090/9073257.pdf
    • http://files.dslvnjny.com/uploads/1/3/1/3/131379189/dd9af1efc2533.pdf
    • http://files.52westsalon.com/uploads/1/3/1/4/131406104/4e9b1fbcdd0a578.pdf
    • https://494cd54b-9bf6-445e-8b0f-2cf8c1a9d7ff.filesusr.com/ugd/cc3ca9_7da3c8e76e084d3c84ef8ccb4c166cee.pdf?index=true
    • https://fccadb72-9d90-4d5b-b836-db1ec4a68f2d.filesusr.com/ugd/ee6100_24bfa2ef81ec4881b0c673fd8e9ce995.pdf?index=true
    • https://370b3d59-b14e-4aca-865a-918a2bb78292.filesusr.com/ugd/1acd69_412985f26a084f4ba03ef6c2857e012e.pdf?index=true
    • https://7e966814-f776-4151-a480-b546ff034d6c.filesusr.com/ugd/43d598_cfd6598f285440b5825c8a2d5bd9260b.pdf?index=true
    • https://2c96c15f-d973-442f-ab4a-d6c3a356e6ef.filesusr.com/ugd/28146e_b952c79fbcad478aa0d0b9415499a1f6.pdf?index=true
    • https://994170e0-5e6f-44fc-b6d0-ac5f787147ed.filesusr.com/ugd/60ffa2_28a4876b356b4d01ba91fd720fa4fe4e.pdf?index=true
    • https://48d277d4-9645-4251-8691-66513748e2e1.filesusr.com/ugd/9734e7_0a9bdfffb23845d8aa398bb41e1cf0e0.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/bio_data_format_doc.pdf
    • https://cdn.shopify.com/s/files/1/0462/8542/2752/files/arundhati_movie_isaimini.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8320/files/xiwinul.pdf
    • https://cdn.shopify.com/s/files/1/0468/0774/4666/files/pozisopexanerifimiwero.pdf
    • https://cdn.shopify.com/s/files/1/0431/0443/6390/files/vuzafopag.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006492.bin
4f63904113da2a6793cc75e4a80b551afe0251a79e45f5743736fb09ac1a1f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6492 5388 bytes
font_01_sfnt_off000076d0.bin
8811266198310f3c8ace886b641b8856741f6e954417c43b12ccf43906f24343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D0 15428 bytes

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