Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f27b0b5239ae678…

MALICIOUS

PDF

55.7 KB Created: 2020-08-11 02:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcfa5b34e055983d2f677673bbb0bbdb SHA-1: 11cc86add6c08f84434090a1c2511861d2f80537 SHA-256: 0f27b0b5239ae678232e210417ffbbb03ece8cf9a6baf4552d98eb1d6e808fed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of external links, many pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains a URL that matches the one flagged by the redirector heuristic. This suggests the PDF is designed to distribute malicious content or phish for information by directing users to the identified malicious URL.

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.ru/pify?keyword=detailed+lesson+plan+in+filipino+grade+2+pdf
    • http://files.rollthai.com/uploads/1/3/0/7/130740221/gizeg_fedibig_vefixi.pdf
    • http://files.welldressedmamma.com/uploads/1/3/2/7/132740214/4370d329b9e0e.pdf
    • http://files.talltalesuf.com/uploads/1/3/1/4/131406826/bunotebosizoz-parewamep.pdf
    • http://files.elizabethweybright.com/uploads/1/3/1/3/131380558/2669625.pdf
    • http://files.woodwindfox.com/uploads/1/3/1/6/131606636/2087864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/27841879796.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/catholic_bible_timeline_chart.pdf
    • https://cdn.shopify.com/s/files/1/0437/4318/2999/files/aristofanes_lisistrata.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botudurodakokebavexosox.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/13875450028.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/66188518516.pdf
    • https://cdn.shopify.com/s/files/1/0439/4228/1371/files/duvunuteriwoni.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/77045110341.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2310/files/22698884378.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/bakojusuvufapomovow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081ff.bin
ca95c4033ca4988d640d91c24fb1c3fd5272b1d0c2f4dbb40444e664032a548e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81FF 5128 bytes
font_01_sfnt_off0000937f.bin
ffa154ecc310e41e2e2b817d475419ecd3dbc0f12410e8dc67e44f62ebc64ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x937F 15568 bytes
font_02_sfnt_off0000c349.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC349 4324 bytes

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