Malicious PDF — malware analysis report

Static analysis result for SHA-256 617feb41c5fbe33d…

MALICIOUS

PDF

40.7 KB Created: 2020-08-11 14:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b019d3933a7af7cfd47f10013d01940 SHA-1: 670bc95a077b7984255ea55c2355ea6eded3cef6 SHA-256: 617feb41c5fbe33d9dfb35b1403d7087adb5071c26d4ee51655df2ff61bfa9b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is also present in the document body. The sample also exhibits a PDF SEO link farm heuristic, indicating a large number of external PDF links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure.

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/wb?keyword=rotisserie%20st%20hubert%20menu%20pdf
    • http://files.audaciousdivas.org/uploads/1/3/2/8/132814241/xavezitagigubuf.pdf
    • http://files.malachytallack.com/uploads/1/3/2/3/132303170/425cc7.pdf
    • http://files.alexanderecology.com/uploads/1/3/0/7/130739704/dofute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/33764536876.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/dofonerereduxuba.pdf
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/bestimmter_artikel_englisch.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/fosofekadoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/iron_carbon_equilibrium_diagram_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2857/7447/files/rewikumakaxila.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/laporan_amdal_proyek.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/bogewofa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3117/files/zisare.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/2118223068.pdf
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/90409414218.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/fugawivaz.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_off00004cc4.bin
99de4e4f61bb3cdb9f6f4283cd27935dfbe3d4453f43e7dec7e604d9ef7858e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC4 5188 bytes
font_01_sfnt_off00005e40.bin
4968288cb10fe9e61e92801fa5028c2a432ecd3f6bbe894e46d367be896c4e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E40 10084 bytes
font_02_sfnt_off000080e2.bin
4471f92216f50ed59660dfde07325d7bc7936b356a877ae20405b399f7876638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E2 16060 bytes

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