Malicious PDF — malware analysis report

Static analysis result for SHA-256 055806175dce41a8…

MALICIOUS

PDF

51.4 KB Created: 2020-08-22 03:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b519a4951c056276613fc1a71d5adaa SHA-1: 5949b0a1d2d0ad964488ab6500ac592dc0de1945 SHA-256: 055806175dce41a8c145bf2c031a5d255683024cbc055bdc80e7299b3546f7f8
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent of leading users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.cc/pify?keyword=developer+google+sheets
    • http://files.davehickson.net/uploads/1/3/2/3/132303239/171c61f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/bisiloluzotilivanaxetirug.pdf
    • https://cdn.shopify.com/s/files/1/0438/2559/4530/files/86926035716.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/code_breaker_season_2.pdf
    • https://cdn.shopify.com/s/files/1/0447/7334/3383/files/understanding_the_linux_kernel_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/diwute.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/480i_resolution_in_pixels.pdf
    • https://cdn.shopify.com/s/files/1/0454/7847/7976/files/biostatistics_for_the_biological_and_health_sciences_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7173/files/daxiwobafumabawow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/rack_and_pinion_steering_gear_box.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e59.bin
9b5aaaf964e2d238d9ca71f326d084bf1b30d31eabc811866745f4318224387c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E59 4928 bytes
font_01_sfnt_off00008f2f.bin
7cf07228e30d4e42de744368ecdaa74bf26d94175a9d341a7c37d9b7531ee9ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2F 15780 bytes