Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7471a0728c0d745…

MALICIOUS

PDF

42.2 KB Created: 2020-08-13 00:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea82869dfe9ab9f95bbe7d10d3de6320 SHA-1: 2c8441c82b87c9f6838a5a05cffae0f8030aef60 SHA-256: c7471a0728c0d74501fbe5b3facef494da7fd17f9c605b9aa53e5781da6f9bdc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. The primary malicious link points to a redirector, suggesting an attempt to lead the user to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is largely unreadable binary data.

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/wb?keyword=tabla%20de%20valencias%20de%20todos%20los%20elementos%20quimicos%20pdf
    • http://bakitix.gbeinc.com/uploads/1/3/0/7/130739590/20e0ec34866715.pdf
    • http://pigitafe.leahmarshphotography.com/uploads/1/3/1/6/131636725/koxukepogusokos-lamututal-gutezejotalum.pdf
    • http://files.psyencholotry.com/uploads/1/3/1/4/131438337/milesa_turiwixamu_suxetesodofoso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/the_bourne_supremacy_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/tuxopuzebirilipodavalolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4153/files/html_table_attributes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/mamajesilowulopigovizesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2740/files/campbell_biology_10th_test_bank.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/bobcat_763_specs.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/jejugod.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/sisolipufipake.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/70377720107.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/55307872733.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5626/files/english_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/taxam.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/toe_kick_saw_lowes.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_off00005c5e.bin
240348d084eb4ce67832180f538381eb00c5201f038cbd095e1d260880f972ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5E 5480 bytes
font_01_sfnt_off00006ef9.bin
ce8b8a174e2429edab26ed6e079567ca3c85e8d4f2777d137e6089ecaa537794
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF9 14256 bytes