Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6d09ce5c7393ed…

MALICIOUS

PDF

40.6 KB Created: 2020-08-24 17:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22e0283b3bbcc39c3720d073e6335d8a SHA-1: 3b7c38eba223a4b845252589ade5d44304c31e6c SHA-256: 0f6d09ce5c7393ed53299507557ea40b72fa5a78d49796ac84e84d2735bc348f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to 'mitosis worksheet pdf' and a URL that matches the malicious redirector. The presence of many external PDF links suggests an attempt to obscure the malicious destination and potentially engage in SEO manipulation to increase visibility.

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=mitosis+worksheet+pdf
    • http://mulow.freshsenses.ca/uploads/1/3/1/4/131455734/bojejesug.pdf
    • http://files.capetowndaytours.net/uploads/1/3/0/8/130874629/bugob-bowon-jozopo-vudux.pdf
    • http://files.paaap.org/uploads/1/3/1/4/131438113/sapibex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7127/4146/files/99015881669.pdf
    • https://cdn.shopify.com/s/files/1/0435/5263/7091/files/37467966153.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/cgst_act_cbec.pdf
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/sanskrit_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/41091129343.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/6th_pay_commission_2nd_report_karnataka.pdf
    • https://cdn.shopify.com/s/files/1/0447/8818/7293/files/6th_grade_math_textbook_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1180/9190/files/56089621318.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/31469789442.pdf
    • https://cdn.shopify.com/s/files/1/0440/8003/8053/files/cisco_press_ccna_routing_and_switching.pdf
    • https://cdn.shopify.com/s/files/1/0433/7647/6311/files/47486771382.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/98008925727.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/bing_tradutor_apk.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_off0000611c.bin
8b1e8a411e8c89db2d26aa5fa77b7d369c820688095c2144e5d7287d12684a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611C 5048 bytes
font_01_sfnt_off0000725f.bin
67720ec9dc52d5060920ce9d5f8a13508417d500e91a4a0f322ccc4287caf4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725F 10356 bytes

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