Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb21c9381cca8b3a…

MALICIOUS

PDF

50.7 KB Created: 2020-08-20 07:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8311572ae08f2d139d73bb5ca214abf SHA-1: a722367d0777860564bebbcf5aca04e95903c652 SHA-256: bb21c9381cca8b3a6741ff23bec4c5e331ec4e8e61995cd2b2c083e759f98858
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting an attempt to trick users into visiting it. No scripts were extracted, and the primary malicious activity appears to be link-based redirection.

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=anushka+sharma+video+song
    • http://tuzawur.joysassgrace.com/uploads/1/3/0/8/130814241/zuvogesazomalurem.pdf
    • http://tavokew.indiapropertyinsurance.com/uploads/1/3/0/7/130775795/sasalugopok.pdf
    • http://pazum.trangallan.com/uploads/1/3/1/6/131606339/ffdb97a63608.pdf
    • http://files.hepworthchurch.org.uk/uploads/1/3/0/7/130739758/3916155.pdf
    • https://cdn.shopify.com/s/files/1/0433/5347/3189/files/speak_softly_love_cello_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7684/files/japanese_anime_movies_2019_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/play_store_free_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/vusefijiduduwadanezafela.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6561/files/davoxezepolowutazojina.pdf
    • https://cdn.shopify.com/s/files/1/0435/1072/6815/files/wamipamonesuwa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0577/7832/files/bagalujibipira.pdf
    • https://cdn.shopify.com/s/files/1/0437/9013/9549/files/2766958588.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/16935991389.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/fuxidusomuzogamuduzi.pdf
    • https://cdn.shopify.com/s/files/1/0455/7848/5925/files/boogie_nights_script.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/86281901075.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_off000066ab.bin
e62cbeda07c286af38922435af467dbf5868adf383efb1de3441a0f40d14d8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AB 5120 bytes
font_01_sfnt_off000077db.bin
1ff75d77b074c593a8a3fd274b961a5db164470272335c35d05ea45962b009d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DB 10040 bytes
font_02_sfnt_off00009a55.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A55 16164 bytes
font_03_sfnt_off0000af6a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 4324 bytes

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