Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a529ec3f423900…

MALICIOUS

PDF

42.0 KB Created: 2020-08-05 13:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da193f60db6e60a161dbb55f73c7895b SHA-1: 997400f969c59cc853bc20f084a254ee94dbd61a SHA-256: 63a529ec3f42390039ec419b2c123f8632a72c3607a56b40a2ce9340b9b16a7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though obfuscated, contains the same URL, suggesting it's the primary lure. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a likely attempt to drive traffic to malicious sites.

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.ru/pify?keyword=diviser+pdf+a3+en+2+a4
    • http://files.idahonordic.com/uploads/1/3/0/9/130969553/8b0c47c22328.pdf
    • http://files.stonehengetn.org/uploads/1/3/2/7/132740659/vatukizutij-givima-zunubi.pdf
    • http://files.gettruckedoz.com.au/uploads/1/3/0/7/130740090/951c62.pdf
    • http://files.sawelsh.com/uploads/1/3/1/4/131454151/09b9b05.pdf
    • http://files.theroute92.com/uploads/1/3/0/8/130873973/zuguxizamuri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/97524254249.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5736/files/91450391649.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/nejowege.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0098/files/dazapejodufagolis.pdf
    • https://cdn.shopify.com/s/files/1/0437/4659/0872/files/tuwudepojubad.pdf
    • https://cdn.shopify.com/s/files/1/0437/3885/7623/files/engineering_statistics_montgomery.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/zofozuzofevegujonop.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/xatevidewo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/32037064862.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/64783423638.pdf
    • https://cdn.shopify.com/s/files/1/0432/1122/7300/files/96520011843.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_off0000637b.bin
6e14ce5d8cd311adb9b4a49ed7b1f22e8cf638294cec03bf0447c9df934c04a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x637B 5448 bytes
font_01_sfnt_off00007628.bin
a3f685062a8a74ee20bf410652d72464d5c5d7a83adf5eb9eda3a8f44615afb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7628 11392 bytes