Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd112d3bf0442542…

MALICIOUS

PDF

53.4 KB Created: 2020-08-19 03:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d196d69ce55f2d1f99f2d5b1216c36f6 SHA-1: 7c636a9436092a7dc6478fbfd0e8d6e3b948d3ef SHA-256: cd112d3bf044254201f5318f2c812e859d00d9b5f2f621223d7f7e96fd713f92
152 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as an error message, aiming to lure users to a compromised website. The ML classifier strongly indicated maliciousness, and the PDF was found to contain a large number of external links, suggesting a link farm or SEO poisoning tactic. The primary IOC is the redirector URL, which is designed to lead users to further malicious content.

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=error+lnk2019+unresolved+external+symbol+template+function
    • http://files.chablisienne.ca/uploads/1/3/1/4/131437532/goxer.pdf
    • http://lerif.chinainblackandwhite.org/uploads/1/3/0/7/130775085/8e32d6f322.pdf
    • https://cdn.shopify.c
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/kefonevalokagatojofujom.pdf
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/fuzedejifisesuvufoma.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/blender_2._8_tutorial_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9915/files/koxudupanivi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1189/9551/files/dinunusav.pdf
    • https://cdn.shopify.com/s/files/1/0440/6758/6213/files/introduction_to_statistical_quality_control_7th_edition_solution.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/91792237342.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/g_shock_ga_100_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/23636343591.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7894/files/html_link_to_page.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vololo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7122/files/boxemuneparofakesimevadog.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/environmental_chemistry_5th_edition_solutions_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000702b.bin
5a7799d25185d3a2fb8cec1dfb479d8b021bd25710e395d390dca1b9e974ca4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702B 6056 bytes
font_01_sfnt_off000084ba.bin
20eaf258ea4c4be6646a8d19c14c595d3de06577a87c42238903be486a778a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BA 17056 bytes
font_02_sfnt_off0000b9b5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B5 4324 bytes

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