Malicious PDF — malware analysis report

Static analysis result for SHA-256 b488b832aba639fc…

MALICIOUS

PDF

56.8 KB Created: 2020-08-25 18:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d73750f7daa15830d69279f0c46f66d SHA-1: bf808eb9cdbff71e6e56ec78fb4df509c5119d6d SHA-256: b488b832aba639fc67ad74a6a550c1c45e5b4c96203e1ff5438b5755aad70d89
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body is heavily obfuscated but contains a URL that is also present in the heuristics. The ML classifier strongly indicates maliciousness. The primary attack pattern involves a link farm designed to either boost SEO or redirect users to malicious 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=tafsir+al+tabari+english+pdf
    • http://fadokabe.yalotzcreations.com/uploads/1/3/0/7/130775203/6376747.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3990/files/1200_calorie_low_cholesterol_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59677855830.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6689/files/31547407085.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2808/files/medical_certificate_for_leave_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4854/2109/files/biwuduvijigirimisiluwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3881/files/microsoft_office_2019_mac_preview.pdf
    • https://cdn.shopify.com/s/files/1/0429/4361/1036/files/urine_ketone_bodies_test_manual_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/viennese_waltz_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/54782631448.pdf
    • https://cdn.shopify.com/s/files/1/0436/0152/6948/files/android_support_v7_jar_for_eclipse.pdf
    • https://cdn.shopify.com/s/files/1/0440/5523/2677/files/autoestima_y_autoconcepto_en_la_adolescencia.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_off00006802.bin
a9c18af3fc7cd7476f2c1e3563e12b4f787ceab2e390d59e8054451233af8a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6802 5068 bytes
font_01_sfnt_off0000791d.bin
8ebb2caab636fd0e99b568ea7ee397365c1e357cdba7867049cb610abaabda16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791D 15592 bytes
font_02_sfnt_off0000a8e9.bin
634bf41cd25079465ec817bb4dd583cc7dc9bd44542475815208f9a2e571cbe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E9 18744 bytes
font_03_sfnt_off0000c687.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 4324 bytes

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