Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b25758454b22ba…

MALICIOUS

PDF

41.9 KB Created: 2020-08-06 07:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e550e253cc1edc51690d281915233ad6 SHA-1: fbf084f8033758193d204a49912d97cbd086246d SHA-256: 51b25758454b22ba9c9423d1434ef9a3673da24b39c79a652e7ab809ae02a1ef
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external resources, with one critical link identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Pearson biology textbook online pdf' and a URL that is also flagged as a malicious redirector. This suggests a phishing or scam attempt, leveraging seemingly legitimate content to trick users into visiting malicious sites.

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=pearson+biology+textbook+online+pdf
    • http://files.nzepiphytenetwork.org/uploads/1/3/1/4/131453455/2790285.pdf
    • http://files.fairmounthardwarelumber.com/uploads/1/3/1/0/131071289/5004344.pdf
    • http://files.ywamshipscctx.org/uploads/1/3/0/7/130776673/babax.pdf
    • http://files.studio135onlinestore.com/uploads/1/3/1/4/131452903/mivobedad.pdf
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/poxolutiresakukipe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/81948779770.pdf
    • https://cdn.shopify.com/s/files/1/0434/4643/6006/files/panojorevikokiwefusus.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/medicinal_plants_in_tamilnadu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/megekitibezu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/john_henry_newman_apologia_pro_vita_sua.pdf
    • https://cdn.shopify.com/s/files/1/0437/5222/6974/files/zimojazax.pdf
    • https://cdn.shopify.com/s/files/1/0432/6208/3232/files/35282751070.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/51616861596.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/fifa_2015_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/kojupibipulowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/karajejavazedu.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_off00005401.bin
c6a95292ff86c1c93fa3a89e967453e9646729e3f675d2df97d09c792a7032c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5401 5372 bytes
font_01_sfnt_off0000665a.bin
4f022431b36552c096f38c26c41b2a1d401737ca1a922db3e272f9c54de4d42a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665A 10752 bytes
font_02_sfnt_off00008ac1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC1 4324 bytes

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