Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d113e2733e96dc…

MALICIOUS

PDF

40.8 KB Created: 2020-08-05 02:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3e513c2f2f45a90c2e9ffb3cdfa44ea SHA-1: 15a78f4b091a255bcc0b41932684c5753f1b84b1 SHA-256: 15d113e2733e96dcea0bc2774ab32f5827da62f392353a05e16fb039cdb24098
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to what appears to be a link farm designed to improve SEO, with one prominent link leading to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wb?keyword=fluent%20english%20course%20pdf', suggesting a lure to disguise the malicious intent. The presence of numerous PDF links and a malicious redirector indicates an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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/wb?keyword=fluent%20english%20course%20pdf
    • http://files.sheldonxink.com/uploads/1/3/1/4/131453302/gosozekexa.pdf
    • http://files.lone-viking.com/uploads/1/3/0/7/130776257/juwifiwojugi-fuzavirof-zinaku.pdf
    • http://files.amitytradedays.com/uploads/1/3/2/7/132712129/gesedo-wewoga-domawuno-tezesemowepila.pdf
    • http://files.michellentherapy.com/uploads/1/3/1/4/131407901/6743438.pdf
    • http://files.adamgormley.com.au/uploads/1/3/1/3/131398019/e5397a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/83804505141.pdf
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/zozobojesove.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/46570081782.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/53653289727.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/90788201647.pdf
    • https://cdn.shopify.com/s/files/1/0428/5241/7703/files/19729675425.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/13462746327.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/vetajifigesafafevit.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/zumomegoxudizazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7479/files/capital_humano_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/wefawewupewugidaromem.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/76835262394.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ea.bin
fb5b44505b3dd03c2f5836ee73f7f3c2f3f79a7331d1654fd78d97cc826587ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EA 5160 bytes
font_01_sfnt_off00007481.bin
6bc2dbef254e11c38508ef03a6bd1e194c40d9ed7bd09ca3a2b488ffedc250a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7481 9972 bytes

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