Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd504885308e021a…

MALICIOUS

PDF

63.0 KB Created: 2020-08-17 10:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f27ba96748682907e5fce8d55e5307bb SHA-1: a0ec2742acf521669e9ffec0b48facffb4462f10 SHA-256: fd504885308e021afc11b3c2cc4ce834df58a8e0e531d0f4c8f072822b45bf4f
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting the primary purpose is to lure users to malicious sites. No scripts were extracted, limiting the analysis of specific execution behaviors.

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.com/pify?keyword=benyamin+sueb+film
    • http://files.ripolleslab.com/uploads/1/3/0/7/130775866/mokumepelavivudevaz.pdf
    • http://files.hilaryshomedaycare.com/uploads/1/3/0/7/130775806/zusufemu.pdf
    • http://files.christcenteredtribe.com/uploads/1/3/0/7/130776728/ce34fac5fdb.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/html_template_responsive_bootstrap_free.pdf
    • https://cdn.shopify.com/s/files/1/0448/4271/3250/files/wedojibajovefajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/69285336048.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7067/files/93215005460.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/wallpaper_hd_for_mobile_jio_god.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/99530557163.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/lijune.pdf
    • https://cdn.shopify.com/s/files/1/0428/5572/7260/files/fetovesuvobaluwatexofop.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/13989160820.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/12798270765.pdf
    • https://cdn.shopify.com/s/files/1/0433/4229/9295/files/40927589483.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/official_air_brake_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/26125911811.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_off0000ae40.bin
27cf68a9cb3952f7e82233b407c0bf9b167f6038c3d1350c5d86210e88e44d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE40 5108 bytes
font_01_sfnt_off0000bf95.bin
7a2be7f2a0680c6625bf5bb97a499fe729e7b881924c6c24a94445acd7e4da31
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 15128 bytes