Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9edabdeb026848…

MALICIOUS

PDF

43.4 KB Created: 2020-08-03 19:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b907580b802d5bf0cb15a789187e492 SHA-1: 84bda3d64ebf3d8c016a7fa50afb5bcd99431266 SHA-256: 6c9edabdeb026848f5cd844da433ee1b20f79a3adb4eed296dfc547e6dc53053
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or traffic redirection. One of the primary links, 'https://ttraff.cc/pify?keyword=violencia+domestica+contra+o+homem+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. 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.cc/pify?keyword=violencia+domestica+contra+o+homem+pdf
    • http://files.antiguoantiquesanddecorative.com/uploads/1/3/1/4/131407080/245752d6590c1d.pdf
    • http://files.geophysicalsocietyofalaska.org/uploads/1/3/0/7/130740222/37f7d7f9336d962.pdf
    • http://files.alissaellisphd.com/uploads/1/3/1/4/131452827/844207.pdf
    • http://files.pinky-guerrero.com/uploads/1/3/0/7/130775145/xalofax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/14752156732.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/fizowesedi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1629/7368/files/56810337757.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/55831756647.pdf
    • https://cdn.shopify.com/s/files/1/0439/7934/1982/files/35203517766.pdf
    • https://cdn.shopify.com/s/files/1/0438/9208/0795/files/tobiga.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3445/files/fosofet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7148/files/vatagevosifijamidosep.pdf
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/45506046740.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/14910214320.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/rosuselexagiwag.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5877/files/64556800776.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000675d.bin
6eb895fca15320053013355bd81c0d51fb8944805c46b7b54d52275f88e96a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675D 5360 bytes
font_01_sfnt_off00007970.bin
eb00acf457bc90aa03c6c8f9930ce66f7ef7c07b09bd16a31487120608e14b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7970 12648 bytes

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