Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d01f4869e7fb7c3…

MALICIOUS

PDF

46.5 KB Created: 2020-08-02 18:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9284d6849ee4bc66fe2e38d86906d550 SHA-1: cd5ee82c253da7109f58583e39940ffeb8195061 SHA-256: 5d01f4869e7fb7c39c180cac232499a7097137f433d6df97e2c50bcf36964a0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is a known redirector, suggesting an attempt to lead the user to a malicious site. The ML classifier also strongly indicated maliciousness.

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=running+total+java
    • http://files.phspiratescheer.org/uploads/1/3/2/8/132815045/182c55.pdf
    • http://files.longbacken.com/uploads/1/3/1/4/131483149/sevepod.pdf
    • http://files.atmosair-singapore.com/uploads/1/3/1/4/131438056/laluje_rixivafelubono_fevawoperowej_nidogu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/59911165360.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/39361835754.pdf
    • https://cdn.shopify.com/s/files/1/0434/0711/4391/files/vozeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puliwaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5144/files/51306626229.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/92754704092.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/gugitelidamovow.pdf
    • https://cdn.shopify.com/s/files/1/0433/7087/2986/files/35622784813.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/automotive_ignition_system_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/78099951452.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/wabunabarukufoza.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/marukinigaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/rimav.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/49506498266.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_off00006f36.bin
6d35fd5ea3e25498f4c0d84d9d616e0d2bf9a54103cc0b3ee7d2331eb20c1917
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F36 4720 bytes
font_01_sfnt_off00007f70.bin
8e1efc0af528f59da2612f3fbc818beb583f86b246f236b21a90906a27c966d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F70 14856 bytes