Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0356e299b666e3…

MALICIOUS

PDF

40.3 KB Created: 2020-08-30 07:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3860982b0befb1974637972e4a90f87b SHA-1: 6c024393fc450c1806f6948e1c249e6d6ce46055 SHA-256: ec0356e299b666e358709adc4edcebefe8c04c197314e9b32fd38d82a8baba5d
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. The document body, though heavily obfuscated, contains the URL that triggers this heuristic. The presence of a large number of external PDF links further supports the classification as a link farm, likely intended to distribute malicious content or conduct phishing.

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/wix?keyword=poet+in+new+york+lorca+pdf
    • https://static.usrfiles.com/ugd/69695d_3231544b7bcf49e091649e0471553564.pdf
    • https://static.usrfiles.com/ugd/9374a7_1fea05d857874b99b997f2c26defff04.pdf
    • https://static.usrfiles.com/ugd/b8c837_271090167dc04bebafb0337794bf4f64.pdf
    • https://static.usrfiles.com/ugd/e32576_a724387473da47abb69db0b04f93e6d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_564152078b1f48c6b8932375a2749225.pdf
    • https://static.usrfiles.com/ugd/6d59ab_08a1502b42b048719eea856991ab4b5f.pdf
    • https://static.usrfiles.com/ugd/c1de29_7d3bbdfbe95344ca950ae831f852fa79.pdf
    • https://static.usrfiles.com/ugd/b8c837_132628c7ef364e36a9117a681bf6acdf.pdf
    • https://static.usrfiles.com/ugd/576447_c5b22f4f20a841459fb0f0fbba332f6b.pdf
    • https://cdn.shopify.com/s/files/1/0440/3704/6437/files/87119781645.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/neguwuxegonijijepabixazan.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/9768644760.pdf
    • https://static.usrfiles.com/ugd/067ecb_fa06a50dda704d5088b283415cfd7642.pdf
    • https://static.usrfiles.com/ugd/3f80ec_d1c8554fc00243df885fd38b6a2471d0.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_off000060a2.bin
1c344c0d6c69292e59be3c535134084c7754be5f07b3049b05db846324fb1e99
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A2 5232 bytes
font_01_sfnt_off0000728f.bin
8520d8a2c7fa24f350498ed7b4d6ceb0dca668d89e405d9bf4ff61eed6d94600
pdf-font-stream PDF embedded font (sfnt) at offset 0x728F 9964 bytes