Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ef872d02de48ee…

MALICIOUS

PDF

65.0 KB Created: 2020-08-20 13:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1133a7013788bee7bdd5a8a4ae9bbfde SHA-1: f1e891d2f8012d7b51aba3fb14739655454639e4 SHA-256: 87ef872d02de48ee45f29cef16be073c28c948bf017e842bbcfba033855415a3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=enclosed+report+%25E4%25B8%25AD%25E6%2596%2587'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict. The primary attack vector appears to be social engineering via a deceptive link within the document body, leading to malicious infrastructure.

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=enclosed+report+%25E4%25B8%25AD%25E6%2596%2587
    • http://files.oszkayconstructioninc.com/uploads/1/3/1/4/131413766/7729ccc22.pdf
    • http://files.sassyarabia.com/uploads/1/3/1/4/131452733/ccffde359c17cf4.pdf
    • http://files.crushblingboutique.com/uploads/1/3/0/8/130873965/fusutinezuzam-woluxela.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/xizijebuxug.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/too_enough_worksheet_doc.pdf
    • https://cdn.shopify.com/s/files/1/0437/1375/7339/files/82487742346.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/jorovimirabiko.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/lebisewejosiraxamopix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/kujunijufejebaziganaberis.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/yara_international_asa_annual_report_2016.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/67044304767.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/mejewipoxuwanexive.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/88400948264.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1833/files/ralifite.pdf
    • https://cdn.shopify.com/s/files/1/0433/5570/1398/files/repenagemus.pdf
    • https://cdn.shopify.com/s/files/1/0439/8225/8334/files/baduralijobekasowuxetedit.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/lajapofaki.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007790.bin
4604788907c36c1d67f2707f75b89cb93207a7e915034802c2051b658a3d09ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7790 16844 bytes
font_01_sfnt_off0000acd0.bin
58db9cc480e3fb9da3471c533d826e1aca2f923085a573b0ef6046f31aa24093		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACD0 3112 bytes
font_02_sfnt_off0000b7d5.bin
82abc4df9def27f4c3a8f79717f796eeb3ccecfe1e0f346da5fb39403c8da89f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D5 4816 bytes
font_03_sfnt_off0000c83b.bin
c085837e1bfd7591bb9847894a501a44cf08d40ebca76e5bfcf9f81ef3a1b86e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC83B 14240 bytes

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