Malicious PDF — malware analysis report

Static analysis result for SHA-256 157680a8bb1fcde4…

MALICIOUS

PDF

67.2 KB Created: 2020-08-16 13:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c31c28c395f793ff633d1d9cd600871c SHA-1: 698d087338db542b700608b257c1715f9993869f SHA-256: 157680a8bb1fcde43e69a3a8d808cdb4a1bd6a7c740e7a1b68d7f309b126112a
162 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains this URL and a large number of other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a phishing lure disguised as a free book download.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=oxford+bookworms+library+stage+6+free
    • http://files.kimonocha.com/uploads/1/3/1/8/131856285/0386830003bd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8865/0146/files/lojefan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/tecnicas_de_alimentacion_enteral_y_parenteral.pdf
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/dovesuxigawizukexumu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/disney_blizzard_beach_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/wunidipawiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9517/files/papawo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/bitupurafofuborejanazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/federal_university_of_abeokuta_post_utme_form.pdf
    • https://cdn.shopify.com/s/files/1/0439/6217/1550/files/44985019843.pdf
    • https://cdn.shopify.com/s/files/1/0428/7181/6358/files/28651280537.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/96394072572.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000586d.bin
7f938ddd0c5220babbbcf926da4e6b7c27928ab7a61478848bcb262ead740bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x586D 23192 bytes
font_01_sfnt_off0000a186.bin
9f74a75bdedcdd2058faf7113e47edfcad90007304a3743a9132c864464a6f29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA186 5556 bytes
font_02_sfnt_off0000b493.bin
f35c321008fe760a58fdab471d3274123720bd3bfa066e669c086d6c44c2cfd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 13988 bytes
font_03_sfnt_off0000dc43.bin
31f54bf1b2a0bd5fcefce680aa7bc0ab7b2c48a0f9a6877104dd616c0c0a5462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16160 bytes
font_04_sfnt_off0000f13f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 4324 bytes

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