Malicious PDF — malware analysis report

Static analysis result for SHA-256 a378230660ead8a8…

MALICIOUS

PDF

47.2 KB Created: 2020-08-08 16:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0915c8504869966ad3e50b4a66e0b705 SHA-1: 39835a72303d5911be019f3e6a77f49f5aceeeb4 SHA-256: a378230660ead8a88a42d67e8bccfc8f5f71aea7bfa67672016ec80e0ccaf9be
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains multiple critical heuristic firings indicating malicious redirector links and a link farm. The document body, though heavily obfuscated, contains a URL that matches the redirector link firing. The primary malicious indicator is the presence of numerous links, including one pointing to a known malicious redirector, suggesting an attempt to lure users to harmful content or manipulate search engine rankings.

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=diferencia+entre+temperamento+y+caracter+pdf
    • http://files.grandprixdrivingschool.net/uploads/1/3/2/6/132695839/450e4.pdf
    • http://files.vinyldesignyl.com/uploads/1/3/1/3/131379205/kifewagiv.pdf
    • http://files.jongliddonauthor.com/uploads/1/3/0/9/130969265/zojinupalowusejamuf.pdf
    • http://files.expressionsofvoice.com/uploads/1/3/1/3/131378776/xavipev-raguxizusor-naxarevuvap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/47753411034.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/kti_bendungan_asi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/immigration_court_practice_manual_2017.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/kifubi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5199/7592/files/7927636876.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/37842010908.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/acute_bilirubin_encephalopathy.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/96182620652.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/awolnation_i_am_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/41831626303.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/identifikasi_batuan_sedimen.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/52468293932.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_off0000783d.bin
abdb0e93c3cc2be711c951334c851795bde3dc83686eebe782308fcc440fbc58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783D 5192 bytes
font_01_sfnt_off000089ea.bin
97639496251f7c637f78fad66e56ce8f6fc9f507729ef088e6639a657ffafd36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89EA 10936 bytes

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