Malicious PDF — malware analysis report

Static analysis result for SHA-256 848c97ec91df941d…

MALICIOUS

PDF

52.3 KB Created: 2020-08-07 00:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e264177889773d755d11dd9bdd214f SHA-1: 3840ad3c9cf23ce89089c5392f79695877db5ac4 SHA-256: 848c97ec91df941d25cd6a563ed75a19885b6cdb5a63455aa5a3b71f04175bc7
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate exam paper downloads, but the primary link redirects to known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a deliberate attempt to obscure its true nature through link obfuscation. The document body text, though partially corrupted, contains keywords related to exam papers, reinforcing the lure.

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=bitsat+previous+year+question+paper+download+pdf
    • http://files.1840inc.com/uploads/1/3/1/4/131406715/7789941.pdf
    • http://files.maricainnocente.net/uploads/1/3/1/4/131407965/panegu.pdf
    • http://files.legacytaxidermy.net/uploads/1/3/1/4/131407695/1755698.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/90941724945.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/62029203370.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3151/files/pumapalutowebefekopuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/calendario_mundial_rusia_2020_chile.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/paladin_class_mount.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/potekoxozedajejidodag.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/mapa_de_carreteras_de_asturias.pdf
    • https://cdn.shopify.com/s/files/1/0428/4802/6780/files/bigezodegonemipekifizez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/29646423456.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/63516782984.pdf
    • https://cdn.shopify.com/s/files/1/0428/5697/2455/files/kurililefivenemepuku.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/sukoxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/derosutod.pdf
    • https://cdn.shopify.com/s/files/1/0432/4737/0402/files/thesaurus_synonyms_and_antonyms_free_download.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_off00006581.bin
73d9aad09a20b911913544bf6857e5f29eb1a20f01217cbd259e2005931b7cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6581 5464 bytes
font_01_sfnt_off00007839.bin
ca23280d6903efceecb66d6ec108a9eb48d1302864d572d6db471d3b1283f7ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 5244 bytes
font_02_sfnt_off00008690.bin
ebf54d00ec5e7ddf629294fed19d94b855ad33499a2b960bb83099245476dd71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8690 10480 bytes
font_03_sfnt_off0000aa62.bin
3f4dcc922688364f0522e54422b9701193118374ae12c5f54ecc5c30313665e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA62 17212 bytes

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