Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ddca8d5f676a07c…

MALICIOUS

PDF

42.3 KB Created: 2020-08-17 14:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a681aad1992fa892f01850a8bf9e522f SHA-1: c8a8e5190b2ee29274fd1d06010953be8eaf6e42 SHA-256: 0ddca8d5f676a07c4a96137b37c9556911e0017ec89e77106e87009dbcbbaf3b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to an 'adjective worksheet for class 4 pdf' and the malicious redirector URL. This suggests the document is designed to trick users into clicking the malicious link, likely leading to further malware or phishing content.

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.cc/pify?keyword=adjective+worksheet+for+class+4+pdf
    • http://files.okiegirlscoffee.com/uploads/1/3/1/4/131437822/6901243.pdf
    • http://files.nickpateras.org/uploads/1/3/2/7/132710655/d914f150ae.pdf
    • http://fuvozosu.washingtoncountylivestock.org/uploads/1/3/1/3/131384016/xarenitematakub.pdf
    • http://files.candaceclift.com/uploads/1/3/2/6/132695347/9123736.pdf
    • http://files.14thstreetvintage.com/uploads/1/3/0/9/130969703/c1454.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/imperialismo_resumo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6219/7400/files/rational_and_irrational_thinking.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/grey_science_factorio_blueprint.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/73394992928.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/nalibopuranijamurujepel.pdf
    • https://cdn.shopify.com/s/files/1/0436/2859/3315/files/30161126349.pdf
    • https://cdn.shopify.com/s/files/1/0434/4833/6536/files/14059571219.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/wabiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1906/files/all_aarti_sangrah_in_marathi_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/awg_to_mm2_current_carrying_capacity.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_off00006654.bin
38178bbff73a86c864ee579b1f3ec5ba39eec574596c75b8eb6d80b801152147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 5612 bytes
font_01_sfnt_off00007981.bin
4c9273aaa3700cf3bd866ae5d410a4a91e39e39fc254c0ad20f33cf62a079375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7981 10132 bytes

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