Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a53ef25e7a5a355…

MALICIOUS

PDF

47.8 KB Created: 2020-08-23 22:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b8beb602da3fe837359a36ce34b11f8 SHA-1: 29287b76c0c5819a17a61c3debfe0447c610f07b SHA-256: 2a53ef25e7a5a3555f05642f1e8df7e6a9edea86265d5acd0674a15e133e55de
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the same keywords as the malicious URL, suggesting a lure to a potentially malicious download or phishing page. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=wrecking+ball+song++mp4
    • http://files.roswellorchestra.org/uploads/1/3/0/8/130874254/modepenufeb-gulukedufif-rovafapipixep.pdf
    • http://files.sophyblakeart.com/uploads/1/3/0/7/130739829/xenadevus.pdf
    • http://xesiwu.dollargeneralpennylist.com/uploads/1/3/1/4/131406352/jejale_reputibub_narisikexafovin.pdf
    • http://files.theelevatedtravel.com/uploads/1/3/1/6/131636954/gonikovabos_nipojibezexib_movadefum.pdf
    • http://files.waitstaffphiladelphia.com/uploads/1/3/0/8/130814124/fa034.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8184/files/57238597291.pdf
    • https://cdn.shopify.com/s/files/1/0429/4678/9542/files/calculus_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/gmo_articles.pdf
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/5459674207.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/activation._jar_for_talend.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/59021094056.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/10104885500.pdf
    • https://cdn.shopify.com/s/files/1/0434/2248/2582/files/rusibub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/xoxulop.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
stream_005_off00007f31.bin
7d5df04cc62e2b6401da3276e3a27166df4bc94ce5551f72506fd2fe9d604a55		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7F31 20696 bytes
font_00_sfnt_off00004aad.bin
c93d0d897e8cae84e16feeeba5d141f30e00150f1e3d7b980e8994de048a7972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAD 5268 bytes
font_01_sfnt_off00005c7e.bin
403405f506e961df63ed3ee9999dbae5bff6301d0ae7f0b02df4cc29b25d13d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7E 10092 bytes
font_03_sfnt_off0000a1d8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D8 4324 bytes

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