Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda3aa5ab59916d9…

MALICIOUS

PDF

44.9 KB Created: 2020-08-07 06:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36e783f799645c65017e2c23881806b6 SHA-1: a833e2975ac07465f8a96ecf1f9101635f6783ed SHA-256: cda3aa5ab59916d968cdf8c24989f96b6453db2c404a52c2150439b38e5cc9cc
152 Risk Score

Malware Insights

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

The PDF document exhibits malicious behavior through a critical heuristic firing indicating a link to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, many pointing to external PDF files hosted on Shopify.com, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, and the document body is largely unreadable binary data, but the presence of the malicious redirector and the link farm are sufficient indicators of 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.com/pify?keyword=cambios+psicologicos+en+la+adultez+intermedia+pdf
    • http://files.benniesbarnantiquemall.com/uploads/1/3/1/4/131437532/fimona.pdf
    • http://files.2425york.com/uploads/1/3/0/8/130874090/zitetojegut.pdf
    • http://files.sweetpeaangelz.com/uploads/1/3/1/1/131163599/nokiso.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/jasukezegadumugeloxofazo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/94357383350.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/tigepuginodibabofabak.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/28257324006.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/mamobakovawinenuseza.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/html_button_onclick_download_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/suwutizorurotigofugik.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/gobadefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0293/files/certification_iso_9001.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5734/files/mumokokojoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/55643107697.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/zunebat.pdf
    • https://cdn.shopify.com/s/files/1/0435/5457/0399/files/73064187895.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/ielts_general_writing_task_2_tips.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/xiverotezenifefopadag.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_off00006ef8.bin
f5c2dc93e78bbbf8631f92c075939be49c8d409971c32d15ec26e182f130f402		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF8 5568 bytes
font_01_sfnt_off000081d1.bin
b91af486ab0b3401ad2fc74992a026782e3417ed28977953a8e56fdb0640b19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D1 10676 bytes

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