Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f66ed9dd5b8532…

MALICIOUS

PDF

41.1 KB Created: 2020-08-07 06:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd0e80e8cc16cca08181cc9fb502dd8b SHA-1: 65843e79fde0af3f7930e7a1260b2c0a0bf29e6e SHA-256: f1f66ed9dd5b8532a3c88d143ba922aaae8254943340217199c2bd1cfa424c88
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Marketing skills and techniques pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier 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.cc/wb?keyword=marketing%20skills%20and%20techniques%20pdf
    • http://files.madhatterspopcorn.com/uploads/1/3/1/3/131381450/9550667.pdf
    • http://files.themightypsi.org/uploads/1/3/1/0/131070792/2302327.pdf
    • http://files.dalewoodbaptistpdo.org/uploads/1/3/1/4/131453674/7862620.pdf
    • http://files.timjarick.com/uploads/1/3/1/3/131380558/3653594.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0023/files/18405507315.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/9509141707.pdf
    • https://cdn.shopify.com/s/files/1/0437/8257/0136/files/limejetun.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9813/files/zuxovisarixivovukiniwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7891/0106/files/github_delete_a_commit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/xetiwekakipiniku.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5074/files/bunaxipikizogomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/cancer_de_colon_izquierdo_y_derecho.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/zuvoverexonasetofoji.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/73755719409.pdf
    • https://cdn.shopify.com/s/files/1/0434/0246/1351/files/77959071229.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/31904693780.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_off000061ce.bin
8515382af3ab254272d4c7d5b09d1884e4c43b88cd55467ad5d6d8802b3ab2c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x61CE 5612 bytes
font_01_sfnt_off000074ec.bin
65a788588d67272d672b1a4a96d183b54295ddac675a80b62a77b12cf578a61b
pdf-font-stream PDF embedded font (sfnt) at offset 0x74EC 10152 bytes