Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ce1a84af9ae6f2…

MALICIOUS

PDF

53.2 KB Created: 2020-08-14 02:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2838b4a137a7e7cc2312c0c53419fedc SHA-1: 13988157f77280c4d417a47a7cfaf49526501d80 SHA-256: 84ce1a84af9ae6f2f3735942df9c806e1dbef33f9cd3b49e99d16a6a3c52d3e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing:Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are also present in the list of embedded links. The presence of a link farm and a redirector suggests a phishing or SEO poisoning attack, aiming to lure users to 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.ru/wb?keyword=english%20pronouncing%20dictionary%20by%20daniel%20jones%20pdf
    • http://files.logans-heroes.org/uploads/1/3/0/7/130739614/700476580d51.pdf
    • http://files.moniquenicolecaston.com/uploads/1/3/0/7/130776298/7594f.pdf
    • http://files.geraldsandau.com/uploads/1/3/1/6/131606260/4730791.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4599/files/79492503381.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zodotuxufaliga.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/academic_writing_skills_cambridge.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/master_tung_acupuncture_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/converter_chrome_html_document_to_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/the_root_filesystem_requires_a_manual_fsck.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0454/files/genijod.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/abituriyent_jurnali_3_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/98675732249.pdf
    • https://cdn.shopify.com/s/files/1/0430/6980/0597/files/69982449152.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/48688341246.pdf
    • https://cdn.shopify.com/s/files/1/0432/3409/9362/files/bard_of_blood_book_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9969/files/41608261656.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/jatabuzewawemuluzoraku.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/79754017658.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d0d.bin
5cb46fe0932efc1c4e9b87f1e7aa222fc181c076edd98938c3b07b561007adb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 5692 bytes
font_01_sfnt_off0000a06e.bin
0abaa297e45b41fd0dc1655eff11c32eb0aa858e96ccb7c7fe346d52aea40571		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA06E 11656 bytes

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