Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c22577137ddee90…

MALICIOUS

PDF

44.1 KB Created: 2020-08-12 22:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e69b844c6cccdb633f8b36aff9a15637 SHA-1: 0a8c2e0c08915297f4328ceaa11e31de50ba90cc SHA-256: 1c22577137ddee90e66e09f1640deec791262f4ade61a2d14a4902ee93c3b392
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body is obfuscated but contains the visible lure text '1st law of thermodynamics worksheet pdf' and the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are to benign Shopify domains, suggesting an attempt to blend in or distribute content widely. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent.

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=1st+law+of+thermodynamics+worksheet+pdf
    • http://files.samsaraholidayhouse.com/uploads/1/3/2/6/132681901/givijuwowekiga_xatozalizo_senubolubo_sijiniwefikav.pdf
    • http://files.xmmphoto.com/uploads/1/3/1/3/131383889/ruwonajelebujeresax.pdf
    • http://jatin.jrobsessions.com/uploads/1/3/1/3/131381204/7226282.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/volobufepafolosovi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9315/6259/files/zikawolezizufutofodasali.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/wixefakenufifa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4100/4443/files/49056287320.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6258/files/89505814578.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/40918203959.pdf
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/2151869889.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/63085440531.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5799/files/46504974326.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/literary_criticism_an_introduction_to_theory_and_practice_bressler.pdf
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/xabofu.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
font_00_sfnt_off00004dcf.bin
90cbffdb1405eea01d9b1ec7309a58f7ca94532e3fa3907236ba1e1e4da39447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DCF 2460 bytes
font_01_sfnt_off000058d9.bin
5c67c241928233813863a9f3c99e5cde7276d706704677c7a502e47dd1a19291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D9 5608 bytes
font_02_sfnt_off00006bdf.bin
57e2b462645f876bdcd45221911189b1a72ce3ace3ba82c858b39d7f10100fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDF 9764 bytes
font_03_sfnt_off00008d7b.bin
8ef30eb595737c9edaf2600d9211bf461bc80de8fe90d2dd46013eb69bf7a81f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7B 16180 bytes

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