Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77d7048da661e5b…

MALICIOUS

PDF

45.1 KB Created: 2020-09-10 19:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4691ac4ecaa659d05a35e8ce72b666d SHA-1: 6f77840e41addcd08d1684b6a963d8b83925b909 SHA-256: d77d7048da661e5b216486492dc76e52c0ff9f8fa4fd0bf6a3ebbe1d23ad1f52
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=identifying+verbs+worksheet+high+school+pdf', is designed to lure users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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.link/wix?keyword=identifying+verbs+worksheet+high+school+pdf
    • http://files.stefanodenicolai.net/uploads/1/3/1/3/131398591/68ac636b03d.pdf
    • http://files.theblankbelt.com/uploads/1/3/2/7/132740978/8535425.pdf
    • http://biraput.sealsriflescopes.com/uploads/1/3/0/9/130969352/a54a97.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/jujufuvusepujaxazutetixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/xigupixurazopezigomef.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/gafogovafupiriguzuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/accounting_principles_procedures_mcqs_fpsc.pdf
    • https://cdn.shopify.com/s/files/1/0435/4749/2506/files/kunixofejufiwebukiligude.pdf
    • https://cdn.shopify.com/s/files/1/0437/4947/4453/files/bakenuwebigavub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/19565490114.pdf
    • https://cdn.shopify.com/s/files/1/0440/3773/4550/files/renin_angiotensin_aldosterone_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/pelotero_ballplayer_answers.pdf
    • https://static.usrfiles.com/ugd/01f9b9_7372c1be445940e8a3b406660af05d08.pdf
    • https://static.usrfiles.com/ugd/32777b_0963194cfe3148ef90c41bdd1ccb0e36.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_off000064eb.bin
a1bda8a5303535c76683ccc2889903ccc304aa860928ae62d35eb7bd5ad23536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EB 5392 bytes
font_01_sfnt_off00007750.bin
0e385d2b7670d1a31b1809acdb18ec0a903041b7bd19030becbf00a333e9687e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7750 9964 bytes
font_02_sfnt_off0000995d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x995D 4324 bytes

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