Malicious PDF — malware analysis report

Static analysis result for SHA-256 488f0515b229553f…

MALICIOUS

PDF

41.9 KB Created: 2020-08-23 10:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f9b0a09eefdb1d09890a45fc680beaa SHA-1: 4e146036c9f72bdcb84caf2da85714c076c5163f SHA-256: 488f0515b229553f9c52fe178812a929ea9b1a84de4f26b2adbd7e7c8e23c164
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same malicious URL and text related to anniversary cards, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm its nature as a link farm designed to redirect users to harmful content.

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=happy+marriage+anniversary+cards+free
    • http://tudirep.gifturite.com/uploads/1/3/1/0/131069934/3401989.pdf
    • http://jibivos.carpetcleaningstpete.com/uploads/1/3/0/7/130738948/zikuvunowimabafasor.pdf
    • https://cdn.shopify.com/s/files/1/0435/1852/5599/files/beach_buggy_racing_2_now.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/english_sentences_with_marathi_meaning_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/jejasixanoniwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0446/files/subtle_aromatherapy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/baldur_s_gate_2_enhanced_edition_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/80317122912.pdf
    • https://cdn.shopify.com/s/files/1/0432/8564/3420/files/pabiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/fukuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/90327548384.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/vivir_sencillamente_anselm_grun.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/one_slide_presentation_template_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0435/1492/1114/files/solubility_curve_worksheet_1_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0439/1901/6104/files/87174627796.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95936092566.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_off00006489.bin
a03aaacbf05426074f991b2dc633f0f7bb28a9064d5cc45e61542d38726685a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6489 5564 bytes
font_01_sfnt_off00007763.bin
a0d461f69efe2ca1c3903f2343733d26d631bbb8bd57fcd136f2b491e73ccd1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7763 10348 bytes

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