Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e3a00532de713b…

MALICIOUS

PDF

47.8 KB Created: 2020-08-26 19:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed0d83820b7c896aa5809bb45c522688 SHA-1: a2774056eae2b97db680eac9b51474e0c27c034b SHA-256: c5e3a00532de713b74c9dcae82bad4edda7590f7bff4ea397e3a5c068993c8bd
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a medication advertisement. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=redicres+60+mg' which is flagged as a malicious redirector. The PDF also hosts a large number of external links, many pointing to shopify.com, likely as part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

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=redicres+60+mg
    • http://files.artchaucer.com/uploads/1/3/2/7/132710601/bezox-papep-bosexesokuxuwus-kijetese.pdf
    • http://files.sherburn.com/uploads/1/3/1/3/131397927/6056795.pdf
    • http://jexuvuduw.baddogfarms.net/uploads/1/3/1/4/131438464/770f0.pdf
    • http://files.miehayashimusic.com/uploads/1/3/1/3/131380728/mobivemogif.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/94417907390.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/9412976818.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/princeton_review_1007_gre_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/limilapogekew.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/71427073356.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/hatha_yoga_poses_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/futosinub.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/27164596906.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/boyle_s_law_practice_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/butokafidanaxiwigukevi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/nizakobezekowapoji.pdf
    • https://cdn.shopify.com/s/files/1/0438/8493/7384/files/94802150380.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_off000070ee.bin
c97204f80857d9bac5c711bd2e791bdf34e555b24fd1cc02597187e094172b55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EE 4812 bytes
font_01_sfnt_off0000813f.bin
99bfc02b0ea2db55cca8b7266a3cd98dbf798b8b27c9598be285656bbe7d98a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813F 10244 bytes
font_02_sfnt_off0000a440.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA440 4324 bytes

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