Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce29917f495d47dd…

MALICIOUS

PDF

52.4 KB Created: 2020-08-18 20:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de8b2c77d49446bb4610d10d144ca4d5 SHA-1: 18382a1b23dea9c3f8ac813e9a4ec58fffcaeccf SHA-256: ce29917f495d47dd3eb2486889ef0fe158b914d26be5056022abb40ca47e2987
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Couplet care report sheet' and the malicious URL, suggesting a lure to trick the user into clicking the link. The ML classifier also strongly indicated maliciousness.

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=couplet+care+report+sheet
    • http://files.inzonecoaching.com/uploads/1/3/2/3/132303219/7897598.pdf
    • http://nopipa.bellydancebyraena.com/uploads/1/3/2/8/132814050/vemavadavuzuge_xajodetiki_tiviget.pdf
    • http://files.orlandokb1.com/uploads/1/3/2/7/132710491/5917599.pdf
    • http://files.rgbeautybodyspa.com/uploads/1/3/2/6/132695242/tavufezibipivep_raxes_mozemajovela.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/tri_county_community_college_moodle.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8892/files/skate_3_cheat_codes.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/forumeteselumasez.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6058/files/niduforudabapilora.pdf
    • https://cdn.shopify.com/s/files/1/0453/4956/8667/files/algebra_in_msc_mathematics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/android_studio_gitignore_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/jusijulepesam.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6721/files/cisco_3750v2_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6572/0486/files/piripomikugebesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1278/files/recommendation_letter_template_for_fellowship.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1873/files/xixuwiguno.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_off00007985.bin
3759c1d88dd6c0c51b394b1420005c944a60275e9b1eb836e28165de1909e5d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7985 4928 bytes
font_01_sfnt_off00008a3c.bin
e250ec0e6beafcac5be8c93d045aa2bf69814833738c6d399e853373a489348c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3C 10572 bytes
font_02_sfnt_off0000ae9d.bin
99805584694da40b03156dff3bf6f07dd1df52bbdd03b5ef66e00f913caf3980		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9D 16472 bytes

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