Malicious PDF — malware analysis report

Static analysis result for SHA-256 813a03d0cbfcf472…

MALICIOUS

PDF

67.1 KB Created: 2020-08-16 10:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e2646b4821f04db98e83f82a07d39e7 SHA-1: b97f7c551987f8187250ab5dfe687aac69cd7f2b SHA-256: 813a03d0cbfcf4724dcc200ac6bd7228b4860b200ac699a296b42a82305965fe
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is https://ttraff.ru/pify?keyword=capsim+round+1+r%2526+d+answers, which is flagged as malicious. The document's structure and the presence of many links suggest an attempt to manipulate search engine results or distribute malicious content through a link farm, likely delivered as a spearphishing attachment.

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=capsim+round+1+r%2526+d+answers
    • http://files.goodfoodgroup.org/uploads/1/3/0/7/130740521/efa34c1698937.pdf
    • http://nixil.step-by-stepsurgery.com/uploads/1/3/1/8/131858156/27a90dfc.pdf
    • http://nukamobak.rasacacorporation.com/uploads/1/3/1/6/131606201/b431a9.pdf
    • http://tetalo.carenmadsen.com/uploads/1/3/1/3/131398564/0c0418e4.pdf
    • http://files.wildwaterssoapery.com/uploads/1/3/1/3/131398504/rekug-bobumof-zupanufikim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0447/4994/7029/files/aspiration_pneumonia_dog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bukidesokat.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/getelodoladabogenowobepun.pdf
    • https://cdn.shopify.com/s/files/1/0429/9276/3039/files/computer_oriented_numerical_and_statistical_methods_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7916/files/machine_gun_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3690/files/4712858631.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/55313721082.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0440/5441/3462/files/consumer_reports_reliable_cars_2014.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/sentence_or_fragment_worksheet_grade_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e3.bin
6af998272c9eb9018069c46429768ca6d6d09c301bf19f28b829b9db5c9916f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 4832 bytes
font_01_sfnt_off0000c520.bin
e301a839fae341a8da344cdde627e0c3ffc4d63adb4389ff8c1293dcb66f28f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 14216 bytes
font_02_sfnt_off0000f16e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 4324 bytes

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