Malicious PDF — malware analysis report

Static analysis result for SHA-256 915b82d78050aefd…

MALICIOUS

PDF

45.1 KB Created: 2020-08-15 00:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e23207b908c4eba59c9a7543147f77a2 SHA-1: 6dad9160dcb1255b1e6c591beb1a643a499dcd0d SHA-256: 915b82d78050aefdc8b16d5ea14bb05f9e1ae8d68cf3f42eabc86eda8378eb0d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body mentions 'cbic exam secrets study guide pdf', suggesting a lure to download study materials. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via deceptive links within the document.

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=cbic+exam+secrets+study+guide+pdf
    • http://files.mn4ne.org/uploads/1/3/1/8/131872070/regasewufekosuzakube.pdf
    • http://files.cottagegrovefire.org/uploads/1/3/1/4/131406507/8289d854b.pdf
    • http://zikejenil.abundantlivingpsychologicalandcoachingservices.org/uploads/1/3/0/8/130873951/lawesarav.pdf
    • http://files.georgiasociology.com/uploads/1/3/1/1/131163904/2279197.pdf
    • http://files.beautifulmemoriestravel.com/uploads/1/3/2/7/132740501/4718384.pdf
    • https://cdn.shopify.com/s/files/1/0438/6720/9883/files/cello_beginner_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/29801305326.pdf
    • https://cdn.shopify.com/s/files/1/0438/6720/9893/files/bams_full_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0432/3780/2146/files/winupekag.pdf
    • https://cdn.shopify.com/s/files/1/0434/5066/3062/files/zefirelavebesonumipubige.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/90399769513.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/65200214024.pdf
    • https://cdn.shopify.com/s/files/1/0438/9689/7704/files/valujuxumabegaxojewizi.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_off000062e7.bin
575ab04b4f8b34dc3cc8880e604d39a4156f60d50643b462069d9f6f2f3de8d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E7 5440 bytes
font_01_sfnt_off00007579.bin
9e17d3d6c27b69ae2280a2c38d6e0824402027dae421469e1efebaeebc9ad6e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7579 10552 bytes
font_02_sfnt_off000099a7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x99A7 4324 bytes