Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dd6e87588a8bb2…

MALICIOUS

PDF

44.9 KB Created: 2020-08-10 08:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef983ecd856a0ee12a140fcc8fb2901b SHA-1: dd705ce606b13c490dbcbaf6490be7cd883d241b SHA-256: 55dd6e87588a8bb2897032f66d36362acaffc4ca376b2e42c8b19477501cc2d8
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of a large number of external links, many pointing to Shopify domains with numeric slugs, suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=abecedario+para+imprimir+letras+grandes+pdf
    • http://files.sint-maarten-saint-martin.com/uploads/1/3/1/6/131636825/wetiz.pdf
    • http://fopuvig.vancouver604.ca/uploads/1/3/2/8/132816066/tupurugixi.pdf
    • http://files.waterloo-association.com/uploads/1/3/0/7/130739826/9299742.pdf
    • http://files.jacobxsullivan.com/uploads/1/3/1/0/131071145/kaduwejiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/70716469928.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/4682040109.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/function_of_rough_endoplasmic_reticulum.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/edit_text_online_free_without_watermark.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/applebee_s_international_inc_fiesta_lime_chicken.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6731/files/fire_emblem_the_sacred_stones_roms.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/the_hobbit_study_guide_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/pivanatugodinabukud.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/zomex.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8827/files/sefazupakajokuzilezeraf.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/17738661369.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_off0000647c.bin
253ecb9492d69e50aad2a92ab8f8698c1db23422a6084cffc53f381e6c5f01fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647C 5604 bytes
font_01_sfnt_off0000776a.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776A 1800 bytes
font_02_sfnt_off00007ff7.bin
67b264d98b1d2ee51a7c26403ed16284e042de148ce7fcaca3724cf267b3f4bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF7 11120 bytes

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