Malicious PDF — malware analysis report

Static analysis result for SHA-256 52870b7e205b9fcb…

MALICIOUS

PDF

44.6 KB Created: 2020-09-02 01:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6d1132c505064deaaa10436342d2ad4 SHA-1: 4bf73b76249928e3b82dd66558eec564b0471914 SHA-256: 52870b7e205b9fcbf38ad9e93c6a9f62eaf9ec318b9076341ec7279e18c0e8fa
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'blueberry bush planting guide' and includes the malicious URL, suggesting a lure. The PDF also hosts a large number of external links, indicating a link farm strategy. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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=blueberry+bush+planting+guide
    • https://cdn.shopify.com/s/files/1/0431/2816/0418/files/39696646586.pdf
    • https://cdn.shopify.com/s/files/1/0439/2907/5880/files/makemkv_1._10._4_registration_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/26142270962.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/28305151253.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7912/files/92405065860.pdf
    • https://static.usrfiles.com/ugd/bd1c09_b364bfd93dbb412284fb0120bf615a6b.pdf
    • https://static.usrfiles.com/ugd/7182f3_9dd32e45a3ac492ba22f5f651ac70f0d.pdf
    • https://static.usrfiles.com/ugd/9fc8c3_78d11ead97f14aefa5dfedb3ab0de238.pdf
    • https://static.usrfiles.com/ugd/f523c3_87161cb4727442eca193fb4f0868703d.pdf
    • https://static.usrfiles.com/ugd/913720_85a1688ee0e14c888e30bbfb6e4933d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc25af426ad04839a74d89c065067bb3.pdf
    • https://static.usrfiles.com/ugd/9904c2_d8e5c7d6d2bd425989c24723b4c4e5c5.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6922/files/duwafoxifodon.pdf
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/safis.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_off000070f0.bin
fe53b00a72844a4d8e021ea6cf37b98c959d64a47e996b172ae59ada0bad78dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F0 5512 bytes
font_01_sfnt_off000083a6.bin
d7ba7ec2e9c4c2940a2505811aa5360ec7bf3f41a3f055b8ff3452895174d704
pdf-font-stream PDF embedded font (sfnt) at offset 0x83A6 10012 bytes