Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c37b68fffd09b5…

MALICIOUS

PDF

38.4 KB Created: 2020-08-21 21:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26304a7780794d509603bd174dd79444 SHA-1: 7966feba2769a2855513148d06be8555a0fe5a75 SHA-256: e1c37b68fffd09b559003fcd1ecf0a56ffc7fe6a3bb6b87ae7addc6ca5dcfa59
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm behavior, embedding numerous external links, many of which are hosted on Shopify. While some Shopify links are benign, the presence of the malicious redirector and the sheer volume of links suggest a malicious intent, possibly for SEO spam or to distribute further malware. The document body is largely unreadable, but the embedded URL 'https://ttraff.com/pify?keyword=connected+fonts+free' is directly visible.

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=connected+fonts+free
    • http://ketoret.arrowcare.com/uploads/1/3/1/8/131871390/4bda64b11e9.pdf
    • http://files.hotstuffnmore.com/uploads/1/3/0/8/130814043/daguvirexof.pdf
    • https://cdn.shopify.com/s/files/1/0434/7595/9973/files/el_cine_antonin_artaud.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/gijipuwip.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/vafavivimerozokedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0598/files/fosapolutojegumijegem.pdf
    • https://cdn.shopify.com/s/files/1/0440/6755/3430/files/como_cambiar_de_a_word_sin_programas.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/3d_max_interior_design_tutorial_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/20095225484.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005be5.bin
0813f42b9a9798c51768143a33086e863282c93fb82b4f511001db99f2944a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE5 4680 bytes
font_01_sfnt_off00006bd6.bin
f27444eaca3899cefa5342bdcd3ad85f004be658d82159c25174e42b4df56a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD6 9864 bytes

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