Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7621a06822ae6c…

MALICIOUS

PDF

44.8 KB Created: 2020-08-09 14:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ef7bb49a813875e0d9af8638ca81e0 SHA-1: 7d93a898977ce461eebfcf59e1be56314ee0405d SHA-256: ad7621a06822ae6ca60b92a9241ae37550bf44736beb610b7a318017fe1ab95e
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at `ttraff.com`. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to Shopify domains, suggesting a link farm or distribution mechanism. The primary attack pattern involves luring users to malicious sites via embedded links within the PDF.

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=sermons+on+trusting+god+in+difficult+times+pdf
    • http://dolin.openedge.org.uk/uploads/1/3/0/7/130776644/6239459.pdf
    • http://files.adrianaspina.com/uploads/1/3/1/3/131378838/835a7d092291.pdf
    • http://zogox.pilatesbyvds.com.au/uploads/1/3/1/3/131383664/porisomix_xoletebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/pdf_file_sample_paper.pdf
    • https://cdn.shopify.com/s/files/1/0439/4447/6840/files/46167132108.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/32405535320.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/pumefuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9558/files/78633499384.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/735384985.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/dinalazobivuwosa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/84946539994.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5268/files/95838499883.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/xigagikujumubedazoler.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_off00007100.bin
effec2f97e8618a94594894a44d1adbda3ca4c180ce333d1c37d1332f58a9ab7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7100 5368 bytes
font_01_sfnt_off00008331.bin
7072400549e322f87c5f84eb38c566014f874543fb16e232f6a20b1589eb33ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x8331 10436 bytes