Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f4fd8836497cd2…

MALICIOUS

PDF

83.0 KB Created: 2020-08-02 20:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f8e12663890f84ed23865c8d63c6fbe SHA-1: f4f54cbbbddae20495d0fefa8bfb13620d5b994d SHA-256: 70f4fd8836497cd2736156f294ffec0236a4c6e6fcc5caa1fe63806570c5662c
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files, a technique often used in SEO link farms. One of these links directs to a known malicious redirector, ttraff.com, indicating a malicious intent to redirect users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=1975+oldsmobile+cutlass
    • http://files.ccstudioinc.com/uploads/1/3/0/7/130776085/822972.pdf
    • http://files.magkiefoundation.org/uploads/1/3/0/8/130813461/2aa5982b44.pdf
    • http://files.thenakedforge.com/uploads/1/3/2/7/132740237/02449fb2984043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/45811308133.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8299/files/getuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/jonalokupolifogexudena.pdf
    • https://cdn.shopify.com/s/files/1/0450/9509/2376/files/thomas_calculus_multivariable_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/15137997142.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9512/files/xupetavufatira.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/voxetojetazabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/karimadepekibasevivoxina.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/tovisar.pdf
    • https://cdn.shopify.com/s/files/1/0433/2866/7798/files/iterate_hashmap_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/4410/1544/files/62870489587.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e4.bin
a1a161866f7b5d556b8bf53e78d736c7551f39b98d51978ad5a71fca1d7eb926		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 5448 bytes
font_01_sfnt_off0000fc5f.bin
093e43d5f97538e5c4992b8f2ac595fa06b5a2c01ec6e22da1757aa0ec8468b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 14688 bytes
font_02_sfnt_off00012a01.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 16060 bytes

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