Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c862fea58f3e18f…

MALICIOUS

PDF

41.1 KB Created: 2020-08-12 06:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0974063c6951b87ed55c8d16a8cb0cbb SHA-1: 66410c2f98e02a6adb12d42ef640a58e038b3881 SHA-256: 3c862fea58f3e18f5613ff9acfcc9e7b30fe7f70a719c8200d178ec6af0bf81f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=sciatic+nerve+exercise+pdf. The document body contains obfuscated text and a reference to the malicious URL, suggesting a lure to trick users into clicking the link.

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=sciatic+nerve+exercise+pdf
    • http://nemun.amodeosfarm.com/uploads/1/3/0/7/130738638/6296f.pdf
    • http://files.farmhandsquartet.com/uploads/1/3/1/4/131437984/61bf408a9c67.pdf
    • http://files.jellybeanschilddevelopmentcenter.com/uploads/1/3/1/6/131606373/af6794f419f699.pdf
    • http://files.glamlashes.shop/uploads/1/3/2/6/132681409/ronuw.pdf
    • http://files.dhschoralmusic.com/uploads/1/3/1/4/131409170/d45ea0.pdf
    • https://cdn.shopify.com/s/files/1/0429/7913/1551/files/84979933565.pdf
    • https://cdn.shopify.com/s/files/1/0437/2617/6407/files/air_conditioning_and_refrigeration_institute.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/lekepokafajewogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0766/files/constant_deviation_spectrometer.pdf
    • https://cdn.shopify.com/s/files/1/0435/6449/9105/files/vigejede.pdf
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/robijitaxisuvuzofu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/tuper_tario_tros.pdf
    • https://cdn.shopify.com/s/files/1/0429/2876/7143/files/pdf_to_word_converter_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/27634999603.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/439782655.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_off000061ba.bin
7b34f7b7ad45f6af2e4b001ac52e4c023ede6c1f0e307c21e5a75e7e9145a2ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BA 5348 bytes
font_01_sfnt_off000073f4.bin
7d00d51f9dcf1b66368677a32b2c1ad2b2cbe47558ecd13938497ff95d3050db
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 10472 bytes