Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74eb5baa979d3a2…

MALICIOUS

PDF

39.2 KB Created: 2020-08-30 14:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fd55c90dbebad0a40c5dbc01bf56c20 SHA-1: f2332dcaf3c1c5d7b52fd11b6557998834117b2e SHA-256: b74eb5baa979d3a25de24440b05c75fe9344127cd047e42df47d92d5723c6e9d
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 pointing to Shopify-hosted PDFs, indicating a link farm likely for SEO manipulation or content distribution. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/wix?keyword=temario+de+desarrollo+humano. The ML classifier also strongly flagged this PDF as malicious.

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=temario+de+desarrollo+humano
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/23938819273.pdf
    • https://cdn.shopify.com/s/files/1/0431/6466/3967/files/learn_swiss_german.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/texomifovokufumasaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5041/files/agrochemicals_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/botulijaku.pdf
    • https://static.usrfiles.com/ugd/07625c_8c7e260265864686b6a471ffb709ddb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_264070d4c1084d1aa4fd2c8dec6a0501.pdf
    • https://static.usrfiles.com/ugd/07625c_1ba818ecd7cd4ec9bf2ba336b3f53820.pdf
    • https://static.usrfiles.com/ugd/1a89c8_4ff7981832da4b0380dd9f823a9b04b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_43908046ed7c433aa70d50bbaae0003a.pdf
    • https://cdn.shopify.com/s/files/1/0440/4926/8886/files/88542660068.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/2675590087.pdf
    • https://cdn.shopify.com/s/files/1/0462/7342/9661/files/assistive_touch_mod_apk_no_ads.pdf
    • https://cdn.shopify.com/s/files/1/0437/6186/0757/files/azoteas_y_muros_verdes.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/zonijojoduku.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_off00004e5d.bin
393ba1c88da7e7d41600b5c5b98a92a683fc08e222b07ba63ceccb1db34f1518
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5D 4816 bytes
font_01_sfnt_off00005e78.bin
386d2dc677a8c8f79e7d160384ecce6704e64d09d20e3b78e91f1535d11698e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E78 10388 bytes
font_02_sfnt_off00008056.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 4324 bytes