Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5aefc303b6a9668…

MALICIOUS

PDF

49.1 KB Created: 2020-08-24 05:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6049743ec10383ef17a6d2d9b6fac92 SHA-1: c4f14ce181657aa80cd60aa4cf78b4242b48b0ef SHA-256: c5aefc303b6a9668a9f3d3c5c1705bcd5da5f9ceb2da7a6704473d74292c2f89
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=basic+drum+beats+sheet+music'. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or contains minimal readable content, but the presence of the link farm and the malicious redirector URL strongly suggest a phishing or malware distribution attempt.

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.ru/pify?keyword=basic+drum+beats+sheet+music
    • http://files.clarkfieldoutdoorsstore.com/uploads/1/3/1/4/131453405/3236220.pdf
    • http://files.mistyoga.com/uploads/1/3/2/7/132740978/kivuzojas.pdf
    • http://files.perennialchildcare.com/uploads/1/3/1/3/131379743/d2a33.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/duloravomamet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7454/files/transformer_voltage_regulator_avr.pdf
    • https://cdn.shopify.com/s/files/1/0432/2466/2173/files/kutozokewamugosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/namizupejepufusotugaje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0438/5102/2501/files/free_xfinity_wifi_username_and_password_2015.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/71575660813.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/riesgos_psicosociales_tesis.pdf
    • https://cdn.shopify.com/s/files/1/0434/8733/0464/files/disido.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/89915067901.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/bipolar_transistor_biasing.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007934.bin
9ed6dff76b2772af66989f37798f87a100d55b814ff75fbbf0a11177516c57a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7934 5336 bytes
font_01_sfnt_off00008b1e.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1E 1800 bytes
font_02_sfnt_off000093ac.bin
e8e7524528086bb4686a8d3a73769c8caccb0b1f19eb88772a85b7ef48328907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93AC 10588 bytes

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