Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16413d24e81dcec…

MALICIOUS

PDF

49.5 KB Created: 2020-08-08 06:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db8e0c7b2829a6947e0cbe1a49d30df8 SHA-1: af6a10e71fd60a2ce431667c04809274c845903d SHA-256: f16413d24e81dcecf3707e60fb739e33c0118279c280f148ba375e213cb206ab
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The PDF contains a link farm and a critical redirector link pointing to a known malicious domain. The document body, though heavily obfuscated, contains the same redirector URL. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of specific execution techniques.

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=carrier+air+conditioner+error+codes+pdf
    • http://files.madlyeclectic.com/uploads/1/3/0/9/130969446/dijosavamepepaw-xapuv-rosum-zesutuwuvubed.pdf
    • http://files.mariachristinepericozzi.com/uploads/1/3/2/7/132741194/zosoxane_pijimutatim_fuvalubopimuwi_bikejew.pdf
    • http://files.ivesart.com/uploads/1/3/1/6/131607029/3129070.pdf
    • https://cdn.shopify.com/s/files/1/0437/6916/8021/files/standard_costing_and_variance_analysis_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6510/files/arriba_spanish_textbook_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/monazata.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/84755284433.pdf
    • https://cdn.shopify.com/s/files/1/0429/7087/4009/files/best_technic_launcher_modpacks.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/55821875043.pdf
    • https://cdn.shopify.com/s/files/1/0433/3980/8922/files/posujetuwufanibenatazad.pdf
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/42399961698.pdf
    • https://cdn.shopify.com/s/files/1/0435/3966/0951/files/7227193834.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/23645740131.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_off00007758.bin
68c50662912851b3a296747faa27f59285f60fb8f4718f8d40eb4e4d99131d17
pdf-font-stream PDF embedded font (sfnt) at offset 0x7758 4928 bytes
font_01_sfnt_off00008820.bin
f6b43c64accdf925ccc0adb13489294cdd430a56bb3bedfd7878085f64ca5cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8820 10232 bytes
font_02_sfnt_off0000aac6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC6 4324 bytes