Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed995cec6356e8ad…

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 16:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb2b74cdf2caccda832480d277b27993 SHA-1: 796ae2b1e356d6c855dc495359c039f6a47b5ce3 SHA-256: ed995cec6356e8ad34b299de0acce4901327d497e9511f13a3c054d69c51ecfe
152 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, primarily through its extensive use of external links. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates a direct link to a known malicious redirector at 'ttraff.ru', suggesting an attempt to lead the user to harmful content. Furthermore, the PDF_SEO_LINK_FARM heuristic reveals a large number of links to other PDFs hosted on shopify.com, which could be part of an SEO manipulation scheme or a link farm designed to distribute malware or phishing lures. No scripts were extracted, but the document body contains obfuscated text and the primary malicious URL.

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/wix?keyword=portable+washing+machine
    • https://cdn.shopify.com/s/files/1/0430/7563/3306/files/40293325356.pdf
    • https://cdn.shopify.com/s/files/1/0445/6205/5332/files/bsc_1_physics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/4895/9141/files/tri_fold_restaurant_brochure_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/35443488683.pdf
    • https://cdn.shopify.com/s/files/1/0434/4096/3750/files/barabasi_linked.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/80460741682.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/fowefewexekeritotivixiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8260/files/britain_for_learners_of_english_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6712/1565/files/alfonsina_y_el_mar_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5637/files/xisawuxiselexokiwazeneb.pdf
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/zunipelunevidi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/60215342103.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f6ca73f67e24d3f811886b111bc1d4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf567948d778449dadfef72b0fab2175.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_off0000655d.bin
42988ac08e86a31768baa3cd23ddc6d3e7e9c557e03f9d1b383ec0bb6dfac3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655D 5448 bytes
font_01_sfnt_off000077c0.bin
a5f9db0bae72443d5ab21babfe35d9124c9cecda930dbe09ddebf75ba1ab19fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C0 10652 bytes

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