Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca37e66720d954b…

MALICIOUS

PDF

38.2 KB Created: 2020-08-21 01:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d467a75b3e367bd5b919724f132d170d SHA-1: 84682a43eae0cc1a143bfe714db861ec984e8621 SHA-256: aca37e66720d954ba9f8011021ccfb2381f9012d2045a594e00c2f8c9b4ccfd2
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous URLs that point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=aankhein+teri+novel+free'. The ML classifier also strongly indicated maliciousness. The presence of a large number of embedded links suggests an attempt to lure users to potentially harmful sites, likely for phishing or malware delivery.

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=aankhein+teri+novel+free
    • http://files.aztralabs.space/uploads/1/3/1/8/131856584/fda8ff2e7.pdf
    • http://files.dibblemusic.com/uploads/1/3/1/0/131071041/mivenikugejap-pijewanibo.pdf
    • http://files.wausauspokeeasy.com/uploads/1/3/2/6/132681901/tafas.pdf
    • http://runebodi.dothemission.com/uploads/1/3/1/8/131871390/3773260.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2168/files/lopotejoduvibe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1306/3327/files/nesojegawetar.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/29138292753.pdf
    • https://cdn.shopify.com/s/files/1/0430/0154/4863/files/vilewinixutasagupab.pdf
    • https://cdn.shopify.com/s/files/1/0436/0011/7928/files/3rd_grade_spelling_words.pdf
    • https://cdn.shopify.com/s/files/1/0436/2256/4000/files/97632482996.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/gareth_morgan_images_of_organization.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/22526571315.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/wosaxelanul.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/chartered_accountant_cv_template_uk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004643.bin
56f22f55faabc733a594c005df86187fb662565b5adffbac810325a01e120d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4643 4576 bytes
font_01_sfnt_off000055bb.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55BB 1800 bytes
font_02_sfnt_off00005e48.bin
e6636a023c23cab662d7edd2b2437ec5233d0b7b355f5be7aabcb40effb3a978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E48 9160 bytes
font_03_sfnt_off00007d81.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D81 4324 bytes

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