Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a04b70c4e8f3284…

MALICIOUS

PDF

74.5 KB Created: 2020-08-02 17:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166864b356152607e2dcb6c365468fbd SHA-1: d9b49f62046e3b39b0ec06d5250c8691105dca62 SHA-256: 8a04b70c4e8f328433c45efc0fd5797cf3b2a543a6586dc21b97f00e45a5bdc0
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised as a search result. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The ML classifier also strongly indicated maliciousness. The PDF appears to be part of a link farm designed 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.cc/pify?keyword=name+something+people+put+on+pasta
    • http://files.elementalflutes.com/uploads/1/3/1/3/131383775/xirogejakowetuxes.pdf
    • http://files.restorationcentercharlotte.org/uploads/1/3/1/3/131383586/safoxigu-sozuleko-daruzesovu-vewujewo.pdf
    • http://files.justdelightfull.com/uploads/1/3/1/8/131871864/tukutenineni-babegig-fopuzobaximas.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/118601314.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/zeninesezagatovexovolax.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/reluxefupazevozeka.pdf
    • https://cdn.shopify.com/s/files/1/0440/6067/2165/files/vunafotawuloxonikekib.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/37259386274.pdf
    • https://cdn.shopify.com/s/files/1/0435/2602/9463/files/23363224598.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/difeso.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/fuxidoza.pdf
    • https://cdn.shopify.com/s/files/1/0433/5013/0846/files/26928687488.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/kakegasiwisegizoge.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/22449506348.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/frost_mage_artifact.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/68361749382.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/nikewigekopobiv.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_off0000e21e.bin
173c8ba4e6003ab13a1f599c18e3dfc1ecfa30647a3dcc35cd0d3adcd20d0de4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 5104 bytes
font_01_sfnt_off0000f362.bin
a3d4b1f4da94085c5682a508910489bb86b4e6763a2d945a39bf24ae8adaabdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 12260 bytes