Malicious PDF — malware analysis report

Static analysis result for SHA-256 842b0dbca86ac968…

MALICIOUS

PDF

46.3 KB Created: 2020-08-20 05:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b65c42ec67f3e7a3e703e281890f451c SHA-1: c4cdb6ff5ccf25285a4062785bf8107ebfec9ea6 SHA-256: 842b0dbca86ac968bdedc20b31a85e2795f9625e22ba020e70df499d161625ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector infrastructure, suggesting an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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=sony+x900f+android+tv+slow
    • http://files.abroaddownunder.com/uploads/1/3/0/8/130814784/c528f3adcfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/borbaad_all_songs.pdf
    • https://cdn.shopify.com/s/files/1/0439/0594/1672/files/surumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/75875147307.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9163/files/ship_of_theseus_movie.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/wibevemi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/20344658637.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6279/files/27755427728.pdf
    • https://cdn.shopify.com/s/files/1/0444/5192/2087/files/time_value_of_money_problems_and_solutions_gitman_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/89334007632.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/past_tense_and_present_perfect_tense_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/64692391672.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007560.bin
aa28da8c03b69bef732a8082b38009e5540d30085ca8b802c4f12dd856dcf7bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7560 5624 bytes
font_01_sfnt_off000088ac.bin
e3f24752dfe136cc065c753a4bc101ce97ecb33ef455a6429260643ad288a15a
pdf-font-stream PDF embedded font (sfnt) at offset 0x88AC 10440 bytes