Malicious PDF — malware analysis report

Static analysis result for SHA-256 623ff90b7b0ba3cd…

MALICIOUS

PDF

41.3 KB Created: 2020-08-07 16:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f55d0db97a7b9411f25b6beec590709 SHA-1: 6c1dcceb418aee7c3b512ca491db2d828e3eb9c4 SHA-256: 623ff90b7b0ba3cd68f0cf67eeb860e0259ba7411c1216e2b5a25c7b6720b445
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service that is known to host malicious content. The document body itself is heavily obfuscated but contains references to the malicious URLs. This suggests a phishing or content-luring attack designed to redirect users to potentially harmful sites.

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=ansiedade+autocontrole+augusto+cury+pdf
    • http://files.mounthebronstem.com/uploads/1/3/0/8/130873728/dfa8a.pdf
    • http://files.torirobinson.com/uploads/1/3/0/7/130740249/1013708.pdf
    • http://files.colusalafco.org/uploads/1/3/2/6/132680784/f159e4238c80e99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/davogagofoxonegaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/18747227360.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/94834841662.pdf
    • https://cdn.shopify.com/s/files/1/0433/2693/1099/files/ball_lightning_cixin_liu_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2247/4651/files/38059985537.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0944/files/zazonaved.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5481/files/57516112417.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0175/files/61261646871.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2137/files/bibopakuzokiluritorapapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84407481133.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/74924398145.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/bekidito.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/97233461172.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055eb.bin
3e7635ab058b50d86acb7e4a8ee82bc77b9509a4c421b6142362b5d8c775808e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55EB 5296 bytes
font_01_sfnt_off000067ff.bin
f2206cb2db0edcf0c7cd544cac91788892aad309e5d0e32185f22d67ec0dac78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FF 9936 bytes
font_02_sfnt_off00008a07.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A07 4324 bytes

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