Malicious PDF — malware analysis report

Static analysis result for SHA-256 2081b5a286433c17…

MALICIOUS

PDF

41.8 KB Created: 2020-08-08 16:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 328cf41d6e08b4ce38534a5e0ab0cbef SHA-1: 4cbae5b21e7f76477421f3a152abc0de3814f411 SHA-256: 2081b5a286433c17491298676f26ca73f9c3e284bdeb21cb457eee77129fb535
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary malicious link, 'https://ttraff.com/pify?keyword=clinical+hematology+atlas+jacqueline+h+carr+pdf', is identified as a known malicious redirector. This suggests the document's purpose is to redirect users to malicious sites through a series of links, likely for phishing or malware distribution.

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=clinical+hematology+atlas+jacqueline+h+carr+pdf
    • http://files.netaganza.com/uploads/1/3/2/6/132681878/3ab48d.pdf
    • http://files.christopherlauto.com/uploads/1/3/1/4/131483214/jinubodilolokuz.pdf
    • http://files.hight.nz/uploads/1/3/0/7/130738799/1445111.pdf
    • http://files.sandersinkstudio.com/uploads/1/3/1/4/131453247/xomikamekuvuma.pdf
    • http://files.sdyjewellery.com/uploads/1/3/1/4/131408741/265247.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/72808110709.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/44433033541.pdf
    • https://cdn.shopify.com/s/files/1/0430/1419/3311/files/49200392098.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/40364767678.pdf
    • https://cdn.shopify.com/s/files/1/0427/4552/8487/files/18364670885.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/toefl_reading_comprehension_passages.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9647/files/functional_programming_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/alphabet_chart_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/60187904886.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/islamic_dictionary_arabic_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/xeveniw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055ac.bin
e973c2d778616ebfd1691b92dd29ca5eed19870e74f446c287daa7026fb21d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55AC 5776 bytes
font_01_sfnt_off00006924.bin
f0b835734cada68bff23c8166bc7cbb575afe894fd15741ec21d2df3be53e7d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6924 10056 bytes
font_02_sfnt_off00008b85.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B85 4324 bytes

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