Malicious PDF — malware analysis report

Static analysis result for SHA-256 137eb4e72dfc13fe…

MALICIOUS

PDF

45.4 KB Created: 2020-08-24 08:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b321df682624af103ddc61416d8ce86 SHA-1: 7a5ee7463fca9b5eb1f055ff12d38c6443be4408 SHA-256: 137eb4e72dfc13fe800e35dfef0c2592ac7fa6c77ce92e0b3d6df51747017260
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same URL and a reference to a 'daily behavior chart template for kindergarten', likely a lure.

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=daily+behavior+chart+template+for+kindergarten
    • http://files.veescape.com/uploads/1/3/2/7/132740181/8034747.pdf
    • http://files.happi-me.org/uploads/1/3/1/3/131380054/kewum.pdf
    • http://files.pennstatecsl.com/uploads/1/3/1/3/131398455/tajuwusesomomij_rovuve_vosurozu_bovukuzawawesol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7970/3451/files/vipagaxorulebivamabezot.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/95549446701.pdf
    • https://cdn.shopify.com/s/files/1/0441/0834/9592/files/93481042850.pdf
    • https://cdn.shopify.com/s/files/1/0432/5939/6254/files/get_your_guide_last_supper_tour.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/55765804086.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/83590003508.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/calidad_total_tqm.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/black_temple_entrance.pdf
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/17583949967.pdf
    • https://cdn.shopify.com/s/files/1/0429/3787/6639/files/bunny_ears_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/pitewo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9607/files/dilevunukiwu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6612/8549/files/53674923210.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_off00007326.bin
f452897cd982c4b75d72a9bd0f931983e2cfe77db0d9abdcedde5600eb828fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7326 5756 bytes
font_01_sfnt_off000086a7.bin
7a094a5c4f955f839917c5ca82acc33e432e986debcd1500cd0a1a113b81547f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A7 9876 bytes

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