Malicious PDF — malware analysis report

Static analysis result for SHA-256 338f4e0717146df0…

MALICIOUS

PDF

47.1 KB Created: 2020-08-30 08:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f86ef4968a4a0ecdbe8c6e9a5d59487b SHA-1: 7f7c8629f3d2d7138d784f77c86e8f69cc117ac2 SHA-256: 338f4e0717146df05ff3f94a57404e126ed8a1706a0458d0f85814d5a95db31b
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The primary malicious URL identified is https://ttraff.cc/wix?keyword=borderlands+2+risiken+und+nebenwirkungen, which likely serves as a gateway to further malicious content. The document body contains obfuscated text and the primary malicious URL, suggesting an attempt to lure users into clicking the link.

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/wix?keyword=borderlands+2+risiken+und+nebenwirkungen
    • https://cdn.shopify.com/s/files/1/0450/6284/8664/files/35919917670.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lobusine.pdf
    • https://cdn.shopify.com/s/files/1/0431/2494/9153/files/zajuvisutovokufegevub.pdf
    • https://cdn.shopify.com/s/files/1/0437/7516/4574/files/45001827052.pdf
    • https://cdn.shopify.com/s/files/1/0438/0242/7554/files/kado_the_right_answer_review.pdf
    • https://static.usrfiles.com/ugd/de3d83_5b796ec3db6c4b478bfe18767b663cd2.pdf
    • https://cdn.shopify.com/s/files/1/0432/1610/9736/files/76786492470.pdf
    • https://cdn.shopify.com/s/files/1/0462/2086/9786/files/calorie_deficit_calculator_jillian_michaels.pdf
    • https://cdn.shopify.com/s/files/1/0447/9310/2493/files/anguttara_nikaya_english_translation.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc29d997332d4c2399494376c25d3128.pdf
    • https://static.usrfiles.com/ugd/078c79_6af7979b627b4347af07f4ab83519283.pdf
    • https://static.usrfiles.com/ugd/b8c837_5534b1fd798b4bd2ab91d8ec39330eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0211ac8a26b74ddd899207dd28056655.pdf
    • https://static.usrfiles.com/ugd/5ecadc_f045e5d1bed4479fafeef52e7bad34ca.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_off000077af.bin
ed6147d67e7e6d6fb1636a39557eda42782e642067cd9c8ed05fa16695510ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AF 5472 bytes
font_01_sfnt_off00008a6b.bin
7fbd026a6f61ffcbcce8619e9df1e20ca2a0bfb0461009872f8f1737c600fbbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6B 10780 bytes

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