Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4583b710175e9a3…

MALICIOUS

PDF

54.5 KB Created: 2020-08-26 09:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c5e11511eb24ad21345ef936473430f SHA-1: f1badeab9392dd4cdedd34ee76a69501234aa160 SHA-256: f4583b710175e9a3e201889d5c57ce08e87e1394fa58dc65fd1aab3ef216939e
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 of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains text related to '2nd puc biology important questions with answers pdf download', suggesting a lure to trick users into clicking the malicious links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link-based attack.

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=2nd+puc+biology+important+questions+with+answers+pdf+download
    • http://bewinebu.oilmonkees.com/uploads/1/3/1/4/131452938/ladoxomimibokawoxop.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0862/files/ladupozobosuzati.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7431/files/67194765143.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/tavalutezeki.pdf
    • https://cdn.shopify.com/s/files/1/0437/8250/4600/files/latasovuliga.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/51625079638.pdf
    • https://cdn.shopify.com/s/files/1/0434/3965/3030/files/english_grammar_book_for_class_7.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/96800432271.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/75456380168.pdf
    • https://cdn.shopify.com/s/files/1/0434/3224/7457/files/woragulobuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1704/3101/files/71781727496.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/dazogabogawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/free_guitar_backing_tracks-_misc._blues.pdf
    • https://cdn.shopify.com/s/files/1/0460/9556/4964/files/gumezowivuganojiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76423385748.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078bc.bin
3f9c91239ce77a0750be7ced5b5898bda8534c9e869845718e787cf805c14386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BC 6064 bytes
font_01_sfnt_off00008d33.bin
0e6fdd90289dbc8a5a7d26040b3bd9446f21441b6fb51d3d163039ef4f23fb83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D33 13508 bytes
font_02_sfnt_off0000b72e.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB72E 16164 bytes

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