Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3ecaf23df4d2a5…

MALICIOUS

PDF

39.8 KB Created: 2020-08-14 20:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f1630f83535d63dc3f889397b2b65ee SHA-1: 2fdcfca615fe64470aecbc4ee03b0f9f5be8fc3f SHA-256: 9c3ecaf23df4d2a517bf12e86482ff3db063c4cf694c9599b5e66650b313cfcc
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous other links, likely part of a broader campaign to distribute malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file.

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=hungarian+rhapsody+no.+2+piano+sheet
    • http://files.buamplab.com/uploads/1/3/0/7/130740363/2886644.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/42992534208.pdf
    • https://cdn.shopify.com/s/files/1/0437/6182/8001/files/15064120199.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/votijoluvufaxibered.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7542/files/regipazogovatuwetoti.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/72068098963.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/9904732129.pdf
    • https://cdn.shopify.com/s/files/1/0439/6548/1118/files/adverse_childhood_experiences_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/jerijup.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/xepozupixovuzowog.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/10742520752.pdf
    • https://cdn.shopify.com/s/files/1/0435/6905/3854/files/81427190256.pdf
    • https://cdn.shopify.com/s/files/1/0444/8750/8135/files/functional_programming_in_java_manning_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/55734909685.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2357/files/12286444573.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_off00004896.bin
46a9a37cffb3b886e957419760f63e0951c63e844a76080cb340d72287aa7bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4896 5416 bytes
font_01_sfnt_off00005b01.bin
317e5a681daf3a930278a924d2d5e23959cbcefd8060ea91b3628c07345c72c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B01 9784 bytes
font_02_sfnt_off00007cc1.bin
46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC1 16120 bytes

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