Malicious PDF — malware analysis report

Static analysis result for SHA-256 43485cde169c4738…

MALICIOUS

PDF

46.0 KB Created: 2020-08-25 03:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e900d1ad1776be9bfa7ad34555cbcdf5 SHA-1: cb572945d0139329ea6fa29b06ceae0e9c082ee5 SHA-256: 43485cde169c47382baac5411aa93f7f004fbff2884da07f7f9b9383dd36f153
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about anxiety and stress. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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=ansiedad+y+estres+pdf
    • http://files.tasmanianpolarnetwork.com/uploads/1/3/1/0/131070450/tixegobobasapaz.pdf
    • http://files.piltzfamily.waggamatters.com/uploads/1/3/0/7/130776852/zilubu.pdf
    • http://febupobax.marchingtonvillagehall.org/uploads/1/3/2/7/132740541/vozaxubuvetus.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/19205884403.pdf
    • https://cdn.shopify.com/s/files/1/0434/1877/9815/files/polekebonuto.pdf
    • https://cdn.shopify.com/s/files/1/0434/2294/1351/files/female_body_language_signs_of_attraction.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/70101255525.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/piwabi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/55219475893.pdf
    • https://cdn.shopify.com/s/files/1/0444/7302/4679/files/english_speaking_basics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/20011044268.pdf
    • https://cdn.shopify.com/s/files/1/0433/0877/7637/files/kunuzuledagir.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/samufugipazojilemaxer.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_off00006826.bin
84636289f6e940c74a01138d2e9ab40c2340b54d3ef340e4fc8a609d9f9c25be
pdf-font-stream PDF embedded font (sfnt) at offset 0x6826 4772 bytes
font_01_sfnt_off00007861.bin
d71d878ec85d3332b533011e67beab13e9a1eda8e47f494e0694d82f1917611d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7861 11036 bytes
font_02_sfnt_off00009c1f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1F 4324 bytes