Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ae00953261bc81…

MALICIOUS

PDF

34.4 KB Created: 2020-08-19 19:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1586cf943d8adcc6507ac307f0af6058 SHA-1: 9315a29c277250248f1737d8a0c9c73dde2d925f SHA-256: 38ae00953261bc816830eb35b087319c8070c100d79136631d5b6406ce984b55
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. This indicates the primary purpose is to redirect users to potentially malicious content, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=ordering+fractions+from+least+to+greatest+worksheets
    • http://duwik.firstathens.org/uploads/1/3/2/7/132740214/0397b01.pdf
    • http://files.rivendellhouse.net/uploads/1/3/1/1/131164260/2120882.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/fuwuremirezijeneb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9283/files/surgical_anatomy_of_anterior_abdominal_wall.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1413/files/39900138845.pdf
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/akbar_birbal_ki_kahani.pdf
    • https://cdn.shopify.com/s/files/1/0434/3300/1126/files/litafiruvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gotisirifiwixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/veget.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6110/files/75664868979.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/30908037438.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8454/files/mijavinepube.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/10830851895.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/form_g-_45_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/xukoxevereleloruwuravite.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_off00004786.bin
b1b17346dc0d5a9171803ad50a465b013973db93067391ea25b51b69ff20ad43
pdf-font-stream PDF embedded font (sfnt) at offset 0x4786 5620 bytes
font_01_sfnt_off00005a88.bin
43bfab890780975212841f3332f79e3eed88fa62e0bebe56d208423bae6d105b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A88 9968 bytes