Malicious PDF — malware analysis report

Static analysis result for SHA-256 f789c99e8ef63cfc…

MALICIOUS

PDF

45.1 KB Created: 2020-08-24 20:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14f0007598862551a0266bc6867085e9 SHA-1: 276908a1eb6082b54d1f1eec21bde812639e2450 SHA-256: f789c99e8ef63cfc18590f0f62dd4dc6c83d107c6a75ef8be2509b42b2ba9d59
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link disguised as an 'Outlook app android setup' which redirects to a known malicious infrastructure. The document also features a large number of embedded links, many hosted on cdn.shopify.com, suggesting a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is a phishing or redirection attempt.

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=outlook+app+android+setup
    • http://nifose.visualeyeslove.com/uploads/1/3/0/7/130775982/nutesop.pdf
    • http://files.mahoneyhouse.org/uploads/1/3/2/6/132682282/5639032.pdf
    • http://files.mikeforu.com/uploads/1/3/2/7/132740978/sirenes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/gosibiziretirup.pdf
    • https://cdn.shopify.com/s/files/1/0464/3337/0264/files/best_answers_during_job_interview.pdf
    • https://cdn.shopify.com/s/files/1/0435/0027/3830/files/pupedemuwavevigemuwus.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2371/files/43602407945.pdf
    • https://cdn.shopify.com/s/files/1/0429/2358/9788/files/nebiwivoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/40982094672.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/sipumogupajafowif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/galalivenekegukatetuna.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3032/files/18109496519.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/rat_7_mouse.pdf
    • https://cdn.shopify.com/s/files/1/0432/0346/1283/files/99266550954.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/58364944508.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/zapejip.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_off00006516.bin
77785887f458b0d479eb5c0f647156dbd4ff6a7c3b1113f85044e1303cc36052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6516 4928 bytes
font_01_sfnt_off000075e0.bin
ad1d4812beb4d3d4f322c92d42a5fb06ca987192bbe84715517c79d80469fd20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E0 10388 bytes
font_02_sfnt_off00009973.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9973 4324 bytes

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