Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c2033e170dd9f2…

MALICIOUS

PDF

45.7 KB Created: 2020-08-19 07:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bf5e11a19ce6056fd93ebd759e75e94 SHA-1: 84cb859d00c2bd36bfc6d656fa8194b904300600 SHA-256: 66c2033e170dd9f21d2d0b79afe297cd2c1dc99740fda7ad893bca8ed0f9d57a
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to software downloads and includes the malicious URL. The presence of a security bypass heuristic suggests an attempt to evade detection, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=abbyy+fine+reader+full+version
    • http://files.cvubaseball.com/uploads/1/3/0/9/130969993/lebilazu-xusuvaneminu-nawerapatelo-lifilowe.pdf
    • http://files.thegrowingseedsoflove.org/uploads/1/3/1/4/131437513/8025698.pdf
    • http://rasul.christiancounsellingcentre.ca/uploads/1/3/2/6/132695351/jilopib-bikoxiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/75342525780.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5046/files/bepiduduzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/87944406906.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/zokijojutilal.pdf
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/96844400019.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1373/files/millennium_development_goal_5.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1101/files/agnathavasi_bgm_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6746/4093/files/direct_debit_brand_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/11992490775.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/87299418194.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1356/files/dibujarte_libros.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/xovojufimivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0159/files/invertebrate_zoology_download.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000658b.bin
ce06fd60a93a947c407ed62daab1bae28eff9c3026c5ee6faf00fe9d2c44251a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 4992 bytes
font_01_sfnt_off00007686.bin
34584d03bf2dac76bc82580c6286c7cf4c6048ad8d5162afc78c50131120fdab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7686 10964 bytes
font_02_sfnt_off00009bad.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAD 4324 bytes

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