Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa0fe96689beab7…

MALICIOUS

PDF

42.7 KB Created: 2020-08-10 04:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcdf5ce91918d8357c2147df98a2bb3c SHA-1: 6730d4af656b473e220dc4b471acf0e9f2ae068d SHA-256: daa0fe96689beab70cf3305be71e59511c7f623a932db87dd739e865dc4e5db7
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links, 'https://ttraff.ru/pify?keyword=pharynx+and+larynx+anatomy+pdf', is identified as a malicious redirector. This suggests the document is designed as a link farm to drive traffic to potentially malicious sites, possibly for phishing or malware distribution. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm heuristic strongly indicate a malicious intent.

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=pharynx+and+larynx+anatomy+pdf
    • http://gewapedo.woozeyacresllc.com/uploads/1/3/2/3/132303382/c4e85a84492447.pdf
    • http://files.mshipco.com/uploads/1/3/2/7/132741064/gibawakutan_jotuwi.pdf
    • http://files.keppelcoastcameraclub.com/uploads/1/3/2/7/132712358/9966697.pdf
    • http://files.marthalindsell.com/uploads/1/3/2/6/132682528/58e3543f11d3342.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.pdf
    • https://cdn.shopify.com/s/files/1/0434/4617/3852/files/mechanism_of_heterogeneous_catalysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/4204701297.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/25191546327.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/givimetanojesiwa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/lapeboraxovefonepuf.pdf
    • https://cdn.shopify.com/s/files/1/0444/5837/7383/files/virtual_assistant_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/53363041778.pdf
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/papuga.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/catalogo_vimar.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/
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/lapeboraxovef

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000686e.bin
ba5e1f42039a0e0ec0a520e6363c9cfb219cae640490591c4cc11553560b90fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686E 5276 bytes
font_01_sfnt_off00007a42.bin
5d373f85072f0894628a0087005712dff4c92ee6d770e7fd34e595e763d2fea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A42 10272 bytes

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