Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f8d13738b3d8ef…

MALICIOUS

PDF

62.4 KB Created: 2020-08-10 14:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27f1fd61a2b93221f30af78af9647d87 SHA-1: 7e9abf01e398bcf273c3f1ba47f61468333afeb0 SHA-256: 56f8d13738b3d8ef7627f25e2bde14d7c9027c95448a5f67dcd9798c562a85c4
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=estomatitis+aftosa+herpetiforme+pdf, which is likely intended to redirect the user to a malicious site. The presence of numerous links to external PDFs, many hosted on potentially compromised or low-reputation domains, further supports the 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.cc/pify?keyword=estomatitis+aftosa+herpetiforme+pdf
    • http://zaxoriz.hoaks4wheeldrive.com/uploads/1/3/2/3/132303382/fba0245b9.pdf
    • http://tapij.deottoalberto.com/uploads/1/3/0/8/130813821/fozinu.pdf
    • http://mazalobe.hotelshopuk.com/uploads/1/3/0/7/130776131/tugubibatonaz.pdf
    • http://files.pianellilawfirm.com/uploads/1/3/0/7/130738513/lakirarad-rulezidaberona-gipim.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/jugijagisaweg.pdf
    • https://cdn.shopify.com/s/files/1/0438/0780/1504/files/nand_and_nor_as_universal_gates.pdf
    • https://cdn.shopify.com/s/files/1/0437/1703/4134/files/51107109741.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4736/files/89403059102.pdf
    • https://cdn.shopify.com/s/files/1/0431/4369/2445/files/89513059596.pdf
    • https://cdn.shopify.com/s/files/1/0435/0348/5092/files/xukozapomebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1580/files/lizezotuwaxutega.pdf
    • https://cdn.shopify.com/s/files/1/0430/8621/7383/files/22176308167.pdf
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/58604032887.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3057/files/letter_of_intent_for_scholarship_sample.pdf
    • https://cdn.shopify.com/s/files/1/0437/8234/0770/files/limudexomabibe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/duluxudosutuzunapefi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9815/9784/files/encyclopedia_of_general_knowledge_general_awareness.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/69209511977.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_off0000b738.bin
b89f11d1121683d856fcc8b32098fd321e0ebaa50f1ad3fa633169932c60c278		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB738 5208 bytes
font_01_sfnt_off0000c8c4.bin
82d1e667eb6ed6eef4e36842f995f6407cc0192b1b5c67e51af003c640fad8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 10592 bytes

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