Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c5ce9fc2a3bce3…

MALICIOUS

PDF

39.9 KB Created: 2020-09-09 03:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc409e73fee005534faf044f5328012f SHA-1: 45e21d3ef15be970fcce3d3b2883188c158bb71c SHA-256: 83c5ce9fc2a3bce38239ed92ea8c604f2af4a1bb632519572b56820437a36511
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is flagged as malicious, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains the same malicious URL and a search query, indicating a lure to trick users into clicking the link. The presence of numerous other links to benign Shopify PDFs suggests a link farm technique to improve SEO for the 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.me/wix?keyword=android+emulator+ubuntu+32+bit
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/modern_anesthesia_machine.pdf
    • https://cdn.shopify.com/s/files/1/0434/3880/1061/files/45408877131.pdf
    • https://cdn.shopify.com/s/files/1/0435/0679/4651/files/pelazoni.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6463/files/cursive_a_to_z_writing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/amrita_pritam_books_punjabi_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/47699497479.pdf
    • https://cdn.shopify.com/s/files/1/0464/8511/0952/files/dashboard_design_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/41831780560.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1218/files/bartier_cardi_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/6517375494.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1782/files/game_pokemon_let_s_go_pikachu_android.pdf
    • https://cdn.shopify.com/s/files/1/0463/8572/5595/files/pasos_del_aprendizaje_basado_en_proyectos.pdf
    • https://static.usrfiles.com/ugd/963627_cbe7d786f7314bfca775d89ee70a8161.pdf
    • https://static.usrfiles.com/ugd/98e298_a4a6d1c08146434f9fe6c2d25abf438a.pdf
    • https://static.usrfiles.com/ugd/762c1a_2c03fbcfa8094f2199f54d3033b64686.pdf
    • https://static.usrfiles.com/ugd/78daac_e89722b8470d4f64acc0fd8511adc353.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_off00005f55.bin
b82dc5104560db0056c15d62f02ec580a10a761727c75cf135c4499cf08ed3fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F55 5220 bytes
font_01_sfnt_off000070fa.bin
6abc7630acf40edceb9f9bf40da82aeffb22fc97deaf206dbdd051488dc314df
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FA 9888 bytes