Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1bec07aaeb4f1b…

MALICIOUS

PDF

40.5 KB Created: 2020-09-09 12:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21342c4def537a541a42baac21fafce2 SHA-1: 183d5ef2bcaf31045492a214e3762d7b8df863ef SHA-256: 5f1bec07aaeb4f1b3665b669843db17e5c0dec70db4f425dd48d026ea6a15674
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm designed to host numerous PDF files. One of the primary links, 'https://ttraff.club/wix?keyword=esl+money+worksheets', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Esl money worksheets', likely intended to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=esl+money+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/vajiveziwudusudujud.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/10674336373.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/ratibefupafe.pdf
    • https://cdn.shopify.com/s/files/1/0447/6711/7463/files/aronson_stack_for_everybody.pdf
    • https://cdn.shopify.com/s/files/1/0440/7413/9813/files/prepagos_mocoa_fotos_de_amor.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/riduxesegazunimajakibopub.pdf
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/nusufipekiva.pdf
    • https://static.usrfiles.com/ugd/938c70_a29a01014ea54787adcb189bb54ce6af.pdf
    • https://static.usrfiles.com/ugd/0f1814_ba983e90db754ee4932e7bad835979ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ba385f258fd42e9a13ebbb9fe0a3ef0.pdf
    • https://static.usrfiles.com/ugd/efc97f_06cb184d04a24653b2eb319ce4f80b44.pdf
    • https://static.usrfiles.com/ugd/027f51_1f036101c0324f20a1f06beb5fb423b9.pdf
    • https://static.usrfiles.com/ugd/2b25e8_9b21ea9236664bb49ddc0134b98c441c.pdf
    • https://static.usrfiles.com/ugd/3dd68e_bfcf57ad6ccf4ae5ba4597efb3d3ac3e.pdf
    • https://static.usrfiles.com/ugd/e3834b_162cb5427cc14e3988b68bb750dc723b.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_off000060f8.bin
11034cc74067f46b8581d18b0c7788b908561b482fb171cff831ea5b866073f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 4932 bytes
font_01_sfnt_off000071ab.bin
c01c1443bc44998ae2d7fc616ccba1feb3e8e5e6656687c03cde8b29e2aef5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AB 10568 bytes

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