Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ea47eb086fb3b9…

MALICIOUS

PDF

42.3 KB Created: 2020-08-19 10:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29d66547ff24480074a543a6eb0f0c10 SHA-1: f32ae02f6f2509890be4e79445dead489c1602d1 SHA-256: 41ea47eb086fb3b9a46ca9bac6d565954fcac04f4e83968280d947862ce6a3b0
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains references to a 'present perfect spanish worksheet' and numerous Shopify URLs, suggesting a lure to download further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a 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.cc/pify?keyword=present+perfect+spanish+worksheet
    • http://files.artglassforumny.org/uploads/1/3/0/7/130740264/vizivitifazinamezi.pdf
    • http://pemixuru.philipestrada.org/uploads/1/3/0/8/130874049/22dbfb2aa.pdf
    • http://vativ.felicitystevens.com/uploads/1/3/0/9/130969699/7e2c38d29f5.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/wunowiripafegoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2839/files/jump_math_grade_3_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/7598/3765/files/57069215051.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/wogokobenetejomonebuvawem.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/1525008119.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4330/files/avira_free_win_10_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/tudogobutabun.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/33214104447.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/bloons_td_4_free_android.pdf
    • https://cdn.shopify.com/s/files/1/0449/3164/5608/files/afcc_guidelines_for_domestic_violence.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5587/files/48958130000.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/asma_cardiaca.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/law_on_agrarian_reform_barte.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/notodesedidaz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065c4.bin
ddababe42b029c3f20b212f141a01ff9f23965eb2b86cbd0f090a765e44b946c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C4 5228 bytes
font_01_sfnt_off0000778d.bin
63002b587a2163b3138952d2777cff29cec361820247076a160103be12a5fe00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778D 10744 bytes

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