Malicious PDF — malware analysis report

Static analysis result for SHA-256 4012a8cdaab723df…

MALICIOUS

PDF

48.1 KB Created: 2020-08-28 16:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d680d17bdb37775a1a87998ce6324aae SHA-1: 6cb34b57156068a2990447ea1e30391c5cb89e41 SHA-256: 4012a8cdaab723df080ed4dcbd3d9d181522d7f2b9560c30f28412299a2ce449
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'study guide'. The presence of a malicious redirector indicates an attempt to lead the user to a harmful site, likely for further exploitation or credential harvesting. No scripts were extracted, limiting the analysis of direct execution.

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=a+life+beyond+amazing+study+guide
    • http://wivawado.dogknows.co/uploads/1/3/2/7/132740585/zibubesurojez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5276/files/46352963661.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/mubov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/54527633864.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/rakejevaxibad.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3361/files/tamil_dubbed_hollywood_thrilling_movies.pdf
    • https://cdn.shopify.com/s/files/1/0428/1440/6823/files/32731171131.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/42485743243.pdf
    • https://cdn.shopify.com/s/files/1/0430/0826/2297/files/sains_dan_al_quran.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/esl_grammar_test_with_answer_key.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_off0000710f.bin
06b417d529d24076c984ff2f06d9fc9f96cbc8eec569c010240fbb45f949f7e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x710F 5292 bytes
font_01_sfnt_off00008309.bin
c8144dc2823ab29781962639e86337e3f57d9ccfaab3f33d3dc7c8fe844fb3e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8309 10284 bytes
font_02_sfnt_off0000a617.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xA617 4324 bytes